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Ondine has tan skin, short red hair, light teal eyes, and freckles.
The only costume shown from her is a swimsuit, swimming goggles and a blue bracelet.
As Syren, she has dark pink skin, black freckles on her shoulders and elbows, and a lighter pink face with smaller dark freckles. She has short light red hair, and two silver circular horns sticking out of the top of her head. Her eyes have pinkish-red irises and icy blue sclerae. Her black strapless outfit has a fish-scaly look and a light pink lining. Her feet connect together to make a two-pointed pink fin.
Ondine is a sweet and fun girl who enjoys playing games and swimming. She stays cheerful for the most part, although she can become incredibly upset and distressed when faced with huge disappointment, like Kim unknowingly ignoring her attempts to go out with him and showing interest in Chloé instead. She has a huge crush on Kim, even though he does not realize this for the most part, and is shown being overjoyed when Kim asks her to go out to the movies with him.
As Syren, her love for Kim becomes very possessive and obsessive, and she is determined to make him her prince. If anyone threatens her relationship with Kim, such as Ladybug or Cat Noir, she is easily provoked into attacking them. She is completely indifferent to the effects her actions have on others, never once considering the citizens trapped or hurt because of her flooding of Paris.
As a civilian
Ondine is an excellent swimmer.
Syren has the power to control water, her tears causing the pool to overflow until it floods all of Paris and turns it into her own personal domain. She is able to swim incredibly fast and breathe underwater and is also able to blow bubbles filled with air, allowing others to breathe underwater. She says a kiss from her will turn Kim into a merman, allowing him to breathe and live underwater without a bubble.
Ondine is shown to have a romantic interest in Kim in "Syren", but he is oblivious to her feelings, resulting in her being akumatized into Syren, who wishes to make Paris an underwater kingdom for the two of them. She has apparently tried to confess to him many times before but has never been successful. He does realize her feelings for him when she is akumatized, and at the end of the episode, he asks her to go to the movies with him, which suggests that he returns her feelings.
Ondine has not explicitly talked about them, but when she sees them jumping above the pool as they work to gather some escaped animals, she doesn't appear to be scared, so she likely trusts that they will save Paris. As Syren, she despises Ladybug as the latter tries to set Kim free multiple times. She has no problem attacking her and Cat Noir brutally to get her way.
|Miraculous: Tales of Ladybug & Cat Noir Theme Song:||Absent|
|1. "The Collector":||Absent||12. "Captain Hardrock":||Absent|
|2. "Prime Queen":||Absent||?. "Zombizou":||Absent|
|3. "Despair Bear":||Absent||?. "Syren":||Appears|
|4. "Riposte":||Absent||?. "Frightningale":||Pictured|
|5. "Befana":||Absent||?. "Troublemaker":||Absent|
|6. "Robostus":||Absent||?. "Reverser":||Unknown|
|7. "The Dark Owl":||Absent||?. "Anansi":||Unknown|
|8. "Gigantitan":||Absent||?. "Sandboy":||Unknown|
|9. "Glaciator":||Absent||?. "Frozer":||Unknown|
|10. "Sapotis":||Absent||?. "Malediktator":||Unknown|
|Season 2 Specials|
|1. "A Christmas Special":||Absent||2. "Style Queen (The Queen's Battle - Part 1)":||Unknown|
|3. "Queen Wasp (The Queen's Battle - Part 2)":||Unknown||4. "Catalyst (Heroes' Day - Part 1)":||Unknown|
|5. "Mayura (Heroes' Day - Part 2)":||Unknown|
- Her akumatized form was first revealed in a promotional video for Season 2 from TFOU.
- Her names were revealed on April 12, 2018 by an article on Radiotimes.com of the UK.
- Syren will reappear in the two-part special event "The Heroes' Day".
- Her name and her akumatized form might be a reference to an Undine, a species of water elementals or water nymphs.
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