Alya Césaire is a teenage girl who is friends with Marinette Dupain-Cheng. She adores superheroes and runs the Ladyblog for Paris' beloved hero, Ladybug. On occasion she helps Ladybug and Cat Noir as the Fox Miraculous superhero Rena Rouge.
In "Ladybug & Cat Noir (Origins - Part 1)", Alya sat alone in Miss Bustier's classroom at Collège Françoise Dupont. She just switched schools and didn't know anyone. When she saw Marinette Dupain-Cheng being bullied by Chloé Bourgeois and Sabrina Raincomprix, she stepped in and helped Marinette, the two became best friends instantly. They went to the library to study in between classes when they were knocked to the ground from the building shaking. Running over to the library's cameras, they spotted Stoneheart throwing cars and shouting for Kim. Excited, Alya ran off hoping to find a superhero since this was obviously a supervillain. She biked her way to the Parc des Princes where she found Cat Noir fighting Stoneheart alone. She found his partner and encouraged her to join the fray, being saved by the two of them in the process. After Stoneheart was defeated, Alya--recording on her phone--asked the girl what her name was, learning it was "Ladybug". Her video was shown on the news.
In "Stoneheart (Origins - Part 2)", the next day, Alya created the Ladyblog. She confronted Chloé for being rude to Ivan. When Stoneheart busted down Miss Bustier's classroom's door and took Chloé and Mylène Haprèle captive, Alya chased after them, her phone out and ready to capture more footage. She found Cat Noir being attacked by several Stonehearts. Alya tried running from the battle, but a Stoneheart threw a car at her. Cat Noir threw his staff to keep it from killing her, but Alya was trapped. Ladybug freed her. She wasn't able to capture any more of the fight because she missed the battle at the Eiffel Tower. The next day, she and Marinette sat behind Nino Lahiffe and Adrien.
In "The Bubbler", Alya tried to help Marinette get closer to Adrien on his birthday. Since Marinette couldn't give Adrien his gift to his face, Alya forces Marinette to leave it in his mailbox. At Adrien's party, Alya found Marinette and led her to her present so that she could sign it. Alya spotted Ladybug first when she and Cat Noir returned after being sent skyward, starting a chant for the heroes and resulting in the rest of the students being bubbled. The next day, Alya tried to convince Marinette to tell Adrien the truth about his scarf, but Marinette wanted Adrien to be happy instead.
In "Mr. Pigeon", Alya helped Marinette make her derby hat by encouraging her designs. She was technically Marinette's partner in the derby hat competition and stood at the hat podium, waiting for Marinette, who was almost late.
In "Stormy Weather", Alya interrupted Marinette while she was babysitting Manon Chamack and convinced her to go see Adrien's photoshoot in the park. She went along with Marinette's ploy to get Adrien's attention, which somewhat worked. When the shoot needed a girl, Alya pretended to have an allergic reaction to an apple and pulled Marinette away from Manon so that she could join the shoot. Alya went with Manon on the carousel and became trapped when Stormy Weather encased it in ice. Alya distracted Manon with games and stories while the fire department tried breaking them free. They were freed when Ladybug returned the city to normal.
In "Timebreaker", Alya called Marinette and reminded her to get to the Trocadéro for Alix's and Kim's race. She was given Alix's watch, which she then gave to Marinette, who dropped it. She was blamed when Alix ran over the watch because it was Alya's fault for not holding on to the watch, to begin with even though it was Chloé who dropped it. She was hit by Timebreaker and disappeared in the alternative reality. In the new reality, she was warned about Timebreaker by Ladybug and ran to safety.
In "Copycat", Marinette called Alya over to her house for Alya's help in asking out Adrien. She gave Marinette a script to memorize and called Adrien, forcing Marinette to speak with Adrien's voicemail. She emphasized that she leave a message and not improvise. Marinette ignored her advice and threw her cellphone after she finished her message, not realizing it was still recording. Alya tried helping her delete the message but failed. They decided that since Adrien was still in fencing practice, that they go delete the message off his phone. However, a statue ceremony for Ladybug and Cat Noir was taking place and Alya had to cover it for the Ladyblog, so she couldn't help Marinette. Later, Alya called Marinette to tell her about Cat Noir's burglary at the Louvre and to see if she deleted the message. That evening, Alya went to Marinette's room and helped her delete the message. The next day, she managed to invite herself and Marinette to go see a movie with Nino and Adrien that night.
In "The Pharaoh", the previous week, Alya filmed Ladybug flying on a helicopter and dropping her Histoire textbook. She went to the Louvre with Marinette the next day. Marinette told her she found out something about Ladybug at the King Tut exhibit. She told Marinette that only their school used that specific textbook, so Ladybug had to go to their school. When they reached the King Tut exhibit, Jalil Kubdel bumped into Marinette and Alya. He was in a hurry to present his findings to his father. Marinette brought Alya to an ancient papyrus, claiming it had something to do with Ladybug. In fact, that papyrus was a scroll depicting a ritual to bring the dead back to life.
Alya was getting bored and wanted to look at the Histoire book, but the Pharaoh suddenly appeared. Alya immediately began live streaming for the Ladyblog. When Ladybug arrived, she tried telling Alya to hide, but Alya took the movement as a wave. Then, was taken by The Pharaoh after he threw both Ladybug and Cat Noir to the side, deciding to use her in his ritual. Alya kept live blogging the event so that Ladybug and Cat Noir could find her. She managed to get him to explain his entire plot, including using her as a sacrifice and also discovered that Ladybug stopped the Pharaoh the first time he tried bringing the dead back to life over 5000 years ago. The Pharaoh then started the ritual, having the mummies carry her up the Louvre, but Ladybug saved her. This didn't last long and the Pharaoh put her directly on the beam leading to the dark cloud in the sky. When Ladybug decided to sacrifice herself in Alya's place, Alya became very indignant at not being considered excellent sacrifice material. In the end, Ladybug saved her and her phone and when she was asked by Cat Noir if she wanted to figure out his age. Alya says she'll figure it out for herself when the hero destransforms and laughs when Cat Noir runs away run. She went back to the Louvre to find Marinette (who had been turned into a mummy) and found that the Histoire textbook was missing.
In "Lady Wifi", Alya tried figuring out who Ladybug was from the people in her class, but was interrupted by Miss Bustier. After class, Alya tried calling Marinette, but she went straight to voicemail. She searched for her, but couldn't find her. Instead, she saw Chloé suspiciously putting Ladybug-themed paraphernalia in. Alya thought she found Ladybug. She tried calling Marinette again but failed. Instead, she brought Nino in on her plan to reveal Chloé as Ladybug. She managed to get a picture of Chloé's locker, but because of Kim's height, Sabrina's knowledge of school rules, and Chloé's power of manipulation, Alya was suspended for a week. Alya ran out to La Seine and tried calling Marinette, but couldn't get through. Hawk Moth sensed Alya's pain over secrets and betrayals and akumatized her into Lady Wifi.
Lady Wifi first attacked the principal and made him tell the truth about wrongly suspending Alya Césaire. She then went into hiding until she called Chloé's phone. When Chloé picked up, Lady Wifi teleported into Chloé's room, froze her, and unmasked her to all of Paris however, when Cat Noir and the real Ladybug appeared. Lady Wifi freed Chloé and focused her attacks on Ladybug. She followed them through the hotel until she lost signal. Seeing the heroes' plan, Lady Wifi locked all the doors in the hotel stairway and set up a trap in Le Grand Paris' restaurant. Lady Wifi separated the heroes and trapped Ladybug in the kitchen and tried to take off her mask but couldn't. Then, Cat Noir was trapped in the freezer was told by Hawk Moth to let Ladybug use her Lucky Charm and wait for her to detransform. Ladybug, however, had other plans; Cat Noir destroyed the WiFi antenna on the hotel's roof, freeing Ladybug. Together, they defeated Lady Wifi and returned the city to normal. Alya had no idea what happened and immediately wanted an interview with Ladybug and Cat Noir after she came back to herself, but they left before she could interview them. The next day, Alya went over to Marinette's house and showed her her new phone and some pictures of Adrien. Marinette teased Alya about Adrien's pictures and the two girls chased each other on Marinette's balcony.
In "The Evillustrator", Alya was partnered with Adrien and Nino for their particle physics presentation. She wasn't willing to trade groups with Marinette, but she was willing to be Marinette's wingwoman in regards to Adrien. The next day, Alya interviewed Chloé for the Ladyblog because Chloé was attacked by the Evillustrator.
In "Rogercop", Alya attended Career Day with her mother and sometime during the presentations Chloe's bracelet went missing and Chloe accused Marinette of stealing it. But told Marinette if she was Chloe's bracelet she would've ran away too.
In "Dark Cupid", Alya was just finishing class then met up with Marinette who spots Max and Kim eyeing Kim's gift Alya asked if it's for her but Max points out no. That was when she finds out Kim had a crush on someone and asks who the luck lady is but after Alya heard Marinette give Kim advice. She playfully comments that Marinette can't follow her own, then heard her say that she will admit her feelings to Adrien working on their own Operation Valentines Day. Some later, Alya came to Marinette's room with a heart shaped card as Marinette finished her poem she reminds her to sign it then notices a ladybug which calls a sign of good luck. But was surprised that Marinette wasn't paying attention to her blog. After they left the bakery Alya advised Marinette to mail the letter before she backs out and expressed joy for her friend but it was turned to horror when they got an embarrassing of picture Kim from Chloe.
Then, hoped Adrien doesn't do the same thing to Marinette and Alya attempts to calm her down when she desperately tries to get her letter back. Then, Alya notices Dark Cupid above and gets hit by the villain's hate arrows despising Marinette and running off. Just as she was about to cut a picture of her and Marinette in half the miraculous ladybug power returns her to normal asking what is she doing. Then, made her way back to Marinette's house asking if she signed the card, but when Marinette stated "It's all a blur" she laughs in amusement.
In "Horrificator", Alya had the job of scriptwriter for a monster movie the class was making for a film contest. When Mylène runs away out of fear and Chloe takes over her part, she was astonished that Chloe didn't even read the script and much to her shock that it was rewritten to involve a kissing scene by Nino without her approval. Then, Alya gets grabbed by Marinette who agrees with her that the scene shouldn't happen believing it doesn't fit story wise.
Sometime later, she asks Marinette if she found Mylene because the kissing scene was about to happen but they stop it. Because of Chloe's changes and disregards to the script caused Alya to becomes angry and believe that her idea won't work resulting in Chloe leaving the scene. Needing another lead actress she opts Marinette and she assures her that everything will be fine. However, the movie was put on hold when everyone heard a scream and found Kim and Max missing where Alya assumed they were playing a prank. Soon Alya and the others left to inform the principal but find him along with Marinette gone and yet she became excited that Ladybug appeared wishing to blog right away.
Following the heroes, Alya remained at a safe distance with her friends as Ladybug and Cat Noir fought Horrificator, as the villain left a trail to follow Alya discovered that Chloe and Sabrina aren't with them. Tracking the villain to the maintenance room after Ladybug and Cat Noir manage to catch the villain, Alya and everyone played Mylene's favorite song in an attempt to calm the creature. Once everything was returned to normal Alya found out their movie didn't make the cut; despite that Alya thought their movie was great even though kissing scene wasn't what they expected.
In "Darkblade", Alya was approached by Marinette asking why she wasn't running in the class elections, Alya replies she can't because her Ladyblog was a full time job. Back in class when no else will run against Chloe Alya was surprised that Marinette would during their next break she heard that Marinette hadn't thought of a campaign yet. Then, she informed Adrien of Marinette's actions. Sometime later, she called Marinette to tell that Chloe brought Jagged Stone to City Hall and Alya couldn't resist getting an autograph leaving her best friend disgusted.
Then, she heard Darkblade and knights attack Alya translated for the mayor that he was going to be beaten up. When the knights tried to force their way in she and the other students followed Marinette's lead in barricading the door while praising her friend for doing a good job. But when the barricade wasn't good enough Alya headed upstairs with everyone else and during Ladybug and Cat Noir's battle against Darkblade she was briefly turned into a knight herself but was saved by the heroes. After Darkblade's conquest was over, Alya heard that Chloe stole Marinette's diary and recorded her to see if she had an explanation. But after hearing her best friend's speech she praised her a good job and was appointed Marinette's deputy.
In "The Mime", during Ladybug and Cat Noir's latest victory Alya was very happy when she got praised by Ladybug for all her blog work. Eagerly excited she left for Marinette's house to show Marinette right away after leaving her cellphone with her, Alya leaves to retrieve her laptop but soon called her friend over as she has visitors. She is excited for the performance at the Eiffel Tower sometime later, Alya finds out that her phone was missing through Mylene's phone she discovered it's with Marinette and that she'll get it back after the show. Once the performance starts Alya asks Marinette if she brought her phone but when Marinette swoons over Adrien; Alya suggests that she take him to the movies. After the show when Marinette admits that she erased the video, Alya wasn't too mad already knowing of her best friend's clumsiness because she already uploaded to her blog. When Marinette spoke of a surprise Alya became very excited to have another interview with Ladybug. After Alya leaves the theater she gets asked by Marinette if she could see the video but Alya says after she uploads it to her blog refusing to lose the video as she played keep away with Marinette.
In "Princess Fragrance", Alya was in Chemistry Class and soon asked by Ms. Mendeleiev’s about Marinette's whereabouts. But when Marinette finally arrives she was mortified by her latest excuse after leaving the school and also admits that Marinette and Adrien are made for each other. When she sees that Adrien missed his Chemistry Class and advised Marinette to give Adrien her notes. But unbeknownst to her, Marinette had somewhere important to be however having enough of the girl's excuses she literately pushed her to talk to Adrien which caused Tikki to be flunged out of Marinette's bag.
In "Animan", Alya was reading a modeling magazine with Marinette in the courtyard. Then, they are approached by Adrien and Nino who asked Marinette was willing to go to the zoo with him and she awkwardly said yes. After that Alya tried to snap her friend back to reality on what happened, refusing to be alone she was asked by Marinette for help and agrees. At the zoo, Alya stayed in contact with via ear communicator advising her on what to say, but when it results in Alya having a date with Nino she became irritated but admitted she thought of Nino as a brother. When Animan leads the stampede Alya tries to run but ends with Nino inside one of the animal cages because of Ladybug which caused her to groan in annoyance.
After being released she returned to Marinette's house with Nino telling her that they have a lot in common and that Adrien was coaching Nino while they were at the zoo. Also kept Nino in line about Marinette's mystery guy.
In "Simon Says", she was talking with Marinette on her cellphone as she heard that Marinette was grounded. Despite wanting to side with her best friend Alya agreed with Marinette's father about her not being where she was supposed to be. Suspecting that Marinette was living a double life and when Marinette has to hang up Alya tells her to hang in there as she had to go back to babysitting.
In "Pixelator", during job experience day at the Le Grand Paris Hotel Alya lamented over the fact that Chloe was helping her father make the assignment list and was assigned on trash duty. Then, became curious over what Marinette's job was and Mr. Bourgeois explained that a gopher takes care of the customer's needs. After the day is over Alya gets awarded with tickets to Jagged Stone's concert along with her friends.
In "Guitar Villain", she was in the school courtyard looking at a Jagged Stone magazine while Adrien comes over hearing about the rock star's new album and asks Marinette for an autograph. Once he leaves Alya was shocked that Marinette signed an autograph for him and when Marinette starts swooning she gets asked for support and once Adrien was nowhere in sight Alya tells her she was free to fall over.
In "Kung Food", Alya received a call from Marinette saying she needed a translator having an idea. She hung up and called Adrien as well as expected her best friend to ask about her whereabouts texting Marinette saying she owed her twenty thousand croissants.
In "Gamer", at the library Alya was watching some of her classmates tryout for spots in the Mecha Robo Strike III video game tournament. When Marinette was informed she easily caught on to her trick and cheered as Marinette beat Max effortlessly as well as trying to snap her back to reality. Just as the tournament was about to start Alya praised Marinette for doing the right thing and giving up her spot to Max but instead cheers her on when she competes with him.
In "Reflekta", Alya getting ready for class picture day with her classmates due to Marinette being super excited she told her to relax. After the class photo was taken Juleka was akumatized into Reflekta and was one of the few students who weren't affected by the villain. When Reflekta was defeated Alya joined her classmates for a new photo in the park.
In "Puppeteer", Alya was on her way to the movie theaters with Marinette by the subway and soon saw Adrien in the next car. She instructed Marinette to wave back but due to Manon being akumatizied into Puppeteer; Alya was turned into Lady Wifi again as per being controlled she demanded that Marinette gives her the dolls. But when Marinette said she didn't have them Lady Wifi left the train and flew off to Marinette's house, after a brief fight with Ladybug and Cat Noir she escaped with most of the dolls except the Ladybug doll.
Giving the dolls to Puppeter, along with Evillustator, Rogercop and Cat Noir she battled against Ladybug and after the heroine threw her doll Lady Wifi chased after it successfully delivering it to her master at the tv studio. Despite having the advantage Lady Wifi ended up being frozen with the others villains and returned was to normal thanks to Ladybug.
In "Antibug", at school Alya along with Marinette discovered that Chloe was a total wreck and exhausted then found her acting strange. During the next day she heard of Sabrina turning into Vanisher and Chloe into Antibug as well as jokingly waiting for Ladybug and Cat Noir when she saw the two make amends Alya comments that she liked her friendship with Marinette as they fist bump each other.
In "Volpina", Alya hears that a new girl named Lila arrived at the school and when she hears that Lila was so called friends with Ladybug, Alya was so impressed that she got tons of hits for blog that she was completely oblivious Marinette's question.
In "A Christmas Special", Alya was returning to the bakery with Manon and Marinette wishing her best friend a Merry Christmas before returning home to celebrate the holiday with her family. Then, heard from her classmates that Adrien went missing and joined in the search for him after awhile she returned home everything went well until Ladybug and Cat Noir came flying through her apartment window wishing to update her blog. After the heroine summoned her Lucky Charm Alya and her family directed Ladybug to the supplies she needed and just before she left Alya wished her luck. Once Santa Claws is defeated and Adrien has been found Alya along with her friends and family joined everyone at Agreste Mansion for Christmas dinner.
In "The Collector", Alya heard that Adrien was banned from school because he stole his father's book but after it was returned Alya was happy Adrien came back to school.
In "Prime Queen", after Alya received a call from Marinette and eagerly comes over saying she loved hanging out with Marinette and Manon. After everything is set up Alya notices that Marinette is leaving to talk to her parents and will be back soon. Then, she and Manon became one of the guest talkers on Nadja's talk show and asks Ladybug for an interview. After the show ends on a sour note Alya and Manon don't find anything interesting on tv, she mentions that her interview would've been better and assures Manon that Marinette will be back soon and places her in Marinette's bed.
Becomes shocked when Prime Queen appeared on television then, becomes one of the villain's hostages. But after a long night, Alya has placed back home thanks to the Miraculous Ladybug superpower relieved to find Manon safe and sound. When Marinette returned she quickly informed her of what happened and warned her not to talk to her parents. Sometime later Alya appeared on Nadja's new show Side by Side and explained that Cat Noir and Ladybug are not a couple "yet". Back Marinette's house Alya was praised for all the publicity of the Ladyblog by Marinette and was prepared to give autographs.
In "Despair Bear", Alya was recording Mr. Dupain's bakery class as he is making macaroons before the fire alarm goes off as she complimented to Marinette that loves it when she comes for cooking classes. She defends Marinette when she was accused of calling the fire department in bad faith. She is seen at Marinette's house taking pictures of Rose, Juleka, and Mylène wearing Marinette's fashions for her future blog. Until she got invited to a party hosted by Chloé as everyone was slow dancing she advised Marinette to dance with Adrien as she pushed her over to him. Then, slow danced with Nino during the dance she wrapped Marinette's arms around Adrien and resumed dancing with Nino. Until Despair Bear crashed the party and ended up taking control of various people including Alya until when back to normal she asked Ladybug what's going on.
In "Befana", sometime prior Alya was talking to Adrien about Marinette's upcoming birthday but was shocked that Marinette was listening and nervously switched it to take her sisters to the dentist. As Alya was trying to set everything up the group was running behind schedule and when the preparations are finished she called Marinette to come over. As Marinette arrived Alya and her classmates wished her a happy birthday but the celebrations were halted when Befana crashed the celebration when the villain accused Marinette about lying Alya vouched for her about not knowing about the party.
Seeing Marinette cornered Alya rallied up her friends to defend her, she distracted Befana by throwing plates at her but ended up as a coal statue in the process. After Befana was defeated Alya was restored along with everyone else by Miraculous Ladybug and enjoyed the rest of the party.
In "Robostus", Alya was heading to Science Class with her friends until Marinette realized she left her backpack in the Locker Room. She teased her by saying that Marinette better double check to make sure she didn't leave her brain behind too. But when the school's computer system became infected with a virus Alya and her classmates marveled at Max's robot Markov wanting to get some photos for her blog.
In "The Dark Owl", when Alya was heading home from school she invited Marinette over for slumber party but when Marinette said she had to help her parents at the bakery, Alya laments that she been helping them all week. Then, the next day after school she was informed that Marinette had to continue helping her parents but had some free time tomorrow while at home she was surprised when Ladybug and Cat Noir appeared asking for a favor. As apart of the heroes plan Alya posed as a villain called Cardboard Girl calling Mr.Damocles by the phone informing him that she captured Cat Noir and Ladybug albeit pretending. Hanging up she was praised by Cat Noir for a convincing performance but was unsure about the costume until the heroes assured her.
However, at the park, the plan ended with bad results even though Alya apologized she commended them for doing the right thing hoping no one else would hear of this. When Marinette came over to her house Alya was playing video games while explaining her latest adventure with her favorite heroes. But was shocked that Marinette won the game and Alya claimed she cheated while tickling her.
In "Gigantitan", Alya was in Marinette's room with Rose, Mylène, Juleka, and Alix, about to reveal what was seemingly a huge secret. When she told them that Marinette was head over heels for somebody, they all laughed at Alya's obvious teasing of Marinette's crush on Adrien (much to the surprise of Marinette). Once they assured Marinette that Adrien didn't know that she had feelings for him, Alya asked if they were willing to participate in a plan they had to get Marinette on a date with Adrien. When they all accepted, Alya and Marinette began to debrief them on the full plan.
After that, everything was set up to execute the plan but during the process, Marinette wanted to help August's mother despite Alya's protest. Things went from bad to worse when August becomes akumatized into Gigantitan she attempted to get more news for the Ladyblog but was pulled to safety by Mylene. Reunited with Juleka and Rose they were shocked that Marinette wasn't with them and went searching for her but ran away in fear of Gigantitan. But when Ladybug was in danger Alya and her friends to distract the villain until they abandoned the rickshaw.
After Gigantitan's defeat, she and her friends were relieved that Marinette was alright and everything went well except for their plan. But seeing Adrien not too far away Alya was still excited that the plan could still work, but was told by Marinette they were done with complicated plans. Watching close by Alya and her friends pushed her to say yes to Adrien's offer but was disappointed when she said no rejoining Marinette they praised her for a great effort and took rickshaw ride home.
In "Glaciator", Alya was having a night out with her friends while waiting for Marinette. When she arrived the two shared a hug but was informed by Nino that Adrien couldn't come and they made their way to Andre's ice cream stand as a couple she shared an ice cream cone with Nino. But after Marinette sadly walks away Alya dragged Nino after her trying to comfort her friend.
In "Sapotis", Alya was having a sleepover at her house with Marinette after playing with her younger sisters Ella and Etta she sent them to bed. She told the girls to get some sleep for their exciting day at the amusement park, once alone Alya told Marinette what she discovered about Ladybug finding out that the heroine is no older than they are. Then, Alya mentioned if she knew who Ladybug was, then she could offer the heroine her help but was told by Marinette that heroes must keep their identities secret for a reason to protect their loved ones. But in the midst of it, Alya found her sisters difficult to control when enough is enough she canceled her sister's trip to the amusement park. After hearing a ruckus from their room Alya discovered that they've been akumatized into the real Sapotis. Despite trying to contain them the little monsters escaped into the city and told Marinette to watch over the remaining two while she brought back the others.
Alya tried to reason with some of the Sapotis clones but to no avail until Ladybug arrived. She tried to explain the need to bring her sisters back home and the heroine says there was away. She was asked by Ladybug for her help and Alya eagerly agreed to want to tell Marinette right away and yet was halted by the heroine saying that this must remain a secret. Then, Alya was presented with the Fox Miraculous under the instructions that the Miraculous had to be returned after the mission was over. Upon opening it Alya was introduced to Trixx who was her kwami and easily figured out that it was the kwami that gave heroes their powers as well as bombarding Ladybug with more questions. After transforming Alya took a liking to her new suit and followed by her idol to find Cat Noir.
After saving Cat Noir, Alya introduced herself as Rena Rouge where the cat welcomed her to their team with opened arms. However, introductions were cut short when they were surrounded by the Sapotis'. After retreating to higher ground and Ladybug summoning her Lucky Charm; as Rena Rouge drove the monsters back with Cat Noir she found the items the heroine was gathering very strange. As apart of the plan she was instructed by the cat on how to use her powers after creating a mirage of an amusement park. She noticed her necklace was flashing and understood she was going to change back. However Cat Noir easily brushed it off saying he can keep a secret but the fox retorts as well as being commended for her quick learning. As the Sapotis were closing in Rena asked if this was going to work until the cat assured her. After Etta and Ella returned to normal Rena almost said one of the twins names but was halted by Ladybug. Saying goodbye to Cat Noir, Alya detransforms completely amazed about her first adventure and yet she was hesitant on returning the Miraculous wanting to continue helping her new allies. But under Trixx's words of why Ladybug chose her especially for her trustworthiness and not wanting to betray her idol's trust, she returned the Fox Miraculous and went home.
Hearing the doorbell, Alya finds Marinette saying she tried to call her but wasn't answering. Alya wanted to tell her about the exciting night but remembered the promise she made. And said she was having phone issues but was happy that Marinette was alright. When Marinette said that Ladybug and Cat Noir received help from a new ally Alya begged for details.
In "Gorizilla", Alya was already at the pool with Juleka, Rose and Mylène while waiting for Marinette. She called Marinette on her phone to ask where she was and wasn't too surprised to see her swooning over Adrien's new ad. Sometime later she received an online picture of Marinette with Adrien in the fountain being completely in awe, as the pictures continued to come Alya agreed with Rose that they were so cute together. Finally calling Marinette again, seeing all the pictures she begged her for more details and Marinette agreed but when she asked where they were Alya reminded her that they were still waiting for her at the pool.
In "Captain Hardrock", while setting up for the Music Festival Alya was informed by Nino that Adrien wasn't coming and told Marinette. Although she was unfazed by Adrien not showing up she believed that Marinette was said "compass" that went crazy every time he was around. During sound testing she noticed Marinette eyeing Juleka's brother Luka and referred to him as Marinette's new statue. As Luka played his guitar Alya was surprised that the music caused a sonic boom that was so loud it alerted the police but things went from bad to worse when Juleka's mother was akumatized into Captain Hardrock. When she and her friends refused to play their instruments they all became prisoners at the bottom ship, after Luka and Marinette were freed (thanks to Tikki).
Alya was told they'd be back with help and soon Ladybug arrived setting everyone free from their chains. After the captain was defeated, with the Miraculous Ladybug Alya and the others were sent back to the houseboat with it fully repaired. Once Adrien arrived Alya asked Marinette if her compass was going crazy and enjoy the Music Festival.
In "Troublemaker", she was talking with Nino in the school yard talking with Nino and thought they heard something but saw no one there and resumed talking.
In "Frightningale", she along with her friends were excited to meet Clara Nightningale and to perform as extras in her video. Through her phone, she told Marinette not to do any disappearing acts. Upon making it to Clara's video shoot Alya mentioned that Adrien does resemble Cat Noir and once the singer was heading towards them Alya was shocked when Clara tripped and chose Marinette to be Ladybug. But when Marinette made the choice to be with her friends Alya and her friends gave her a group hug.
But when Chloe arrived disguised as Ladybug Alya noticed that Marinette was getting angry up to the point where she does take the role as Ladybug. During the shoot, Alya took pictures saying that Marinette will be surprised and was amazed at how much she and Adrien physically resembled the real Ladybug and Cat Noir. Due to Chloe and her father canceling the shoot Clara was akumatized into Frightningale. And yet, Alya and her friends fled to safety; once Clara was saved she took part in the singer's new video. Watching it from the school's library agreeing with everyone that she liked this video better than the original.
In "Zombizou", Alya and her classmates were preparing their gifts for Miss Bustier's birthday in the Locker Room she saw that Marinette was running late because she added finishing touches to hers. As everyone shared their gifts Alya and the others marveled at Marinette's gift and yet wasn't too surprised that Chloe hadn't prepared her gift before heading to class. Once they were in Miss Bustier's class they were all to wish her a happy birthday, but Alya's happiness was turned into shock when Marinette's gift was ruined by Chloe. But when she saw that her teacher wasn't upset, Alya said that Chloe was worse than Hawk Moth and was told by Miss Bustier to keep an eye on everything while she and Marinette talked outside.
She was horrified when Miss Bustier came back akumatized as Zombizou, but thanks to Ladybug's intervention Alya and the rest of her classmate escaped. From Sabrina who was affected by Zombizou, they all quickly found out that the kisses were contagious and hid in the Locker Room. Upon Ladybug's arrival inside Alya came out of her hiding place relieved and saw that everyone was fine but Adrien wasn't accounted for; finding him in his locker she was frightened that he was another victim (albeit pretending). Figuring he must have been affected saving Chloe as the zombies come in Alya and everyone moved to the roof. But from the news when she figured out Chloe was the cause of all this she didn't hesitate to give into the villain's demands but was prevented by Ladybug.
With the roof no longer safe Alya and her friends move to a nearby bus and during a ride to the Eiffel Tower, Alya stayed to close to Nino. On the way there they were shocked that Juleka, Rose and Alix became infected too, exiting the bus they all quickly to the tower. And yet, Zombizou's minions were already there and Alya was the next one to become infected knowing it was already too late she told Ladybug to leave and save them all. Fully zombified Alya embraced all fully prepared Nino after Zombizou's defeat she was returned to normal by the Miraculous Ladybug.
During school the next day, Alya demanded that Chloe apologized to everyone for the trouble she caused. Chloe retorted that they should be thanking her for saving by Alya said she had many resources that said otherwise. But she was pulled away by Marinette after she took back what she said earlier at their desks Alya asked if she was still a zombie. Heard Marinette say that Chloe can be good too as long as they continue to show a good example and Alya was surprised that Chloe left a gift for Miss Bustier with their class starting.
In "Syren", Alya was called upon by Ladybug to help her and Cat Noir round up some escaped zoo animals. Using her Mirage powers to secure the panthers with a trail of meat. After that Alya returned the Fox Miraculous and told Ladybug to call upon her again but realized she was late to the movies with Nino, Juleka, Rose, Alix, Max, Kim and Marinette. Once there Alya discovered that Marinette wasn't here yet and decided to wait for her after she arrived they hurried into the theater. However, the movie was cut short when the building started to flood. On the roof, Alya noticed that Marinette in the water and asked where she was going and heard her say she was going to find help.
In "Anansi", Alya was playing a synchronize dancing with Nino as Marinette and Adrien watched, soon her older sister Nora come home. When she asked why her friends were still here Alya explained they were going to see the World Cup tournament fireworks but Nora was strictly against it due to the times she was put in danger and refused to let anyone mess with family. But Alya reminded her sister about what happened at the square. Although admiring her sister's concern but Alya says that she doesn't need protecting and became surprised that Nino offered to protect her. And after Nora challenged Nino to an arm wrestle and purposely won she told Nino to deal with defeat and left to the fireworks with her friends.
When Alya saw a new akumatized villain on the scene she filming for her blog but became disheartened when the villain was her sister. To make matters worse she was taken prisoner by Anansi and when she spotted Nino she told him to run but was glad Ladybug and Cat Noir came to rescue but Cat Noir ended up a prisoner with her. She saw Nino fight off Anansi and when the cat commented on her friend's fighting ability, Alya hoped Ladybug would get back soon. After the heroine arrived Alya saw her appear with a new ally at first she was in awe about him but was suspicious when he spoke similarly to her friend. With the mystery heroes new power, she and the heroes were safely put on the ground, she was relieved that Nora was okay and marveled at the sight of the new hero asking for his name for her blog.
The hero was called Carapace after Nino and Marinette returned Alya comment about what Nino tried to do for her and saw her sister and Nino make up. Then, the gang enjoyed a day at the ice rink.
In "Style Queen", Alya attended Gabriel's fashion to be Marinette's support along with her parents and she pointed out to Tom and Sabine that Marinette is very nervous because this was her first fashion show. But the fashion show was interrupted by Style Queen and Alya was horrified when Adrien was turned into a gold statue and yet she managed to escape with everyone else. She followed Style Queen all the way to the Eiffel Tower as Alya climbed up she kept filming and was soon spotted by Ladybug.
Saying that she wanted to be in the middle of the action Alya was offered the Bee Miraculous by Ladybug. But before she could open it they were attacked by Style Queen and Alya pushed Ladybug out causing only her to become a gold statue. But she was revived by the Miraculous Ladybug (superpower) and returned to the fashion show.
In "Queen Wasp", during the fashion show, Alya streamed to her Ladyblog website viewing Adrien's modeling and Marinette asking for comments about her derby her. She was even more so surprised to be streaming Gabriel's live appearance knowing he hasn't be seen in a long time. And watched Adrien get embraced by his father before heading home.In "Malediktator", while in class Alya, along with Alix, dissed Chloe about being a real superhero and showed what really happened during the events of "Queen Wasp" knowing it was Cat Noir and Ladybug the ones who actually saved the day. Then, she saw Chloe storm out of the classroom and when Alya heard that Chloe was moving to New York, Alya was ecstatic.