There is an ongoing theory with the 4 chinese zodiac being a miraculous to 4 characters
Tiger:Adrien
Rabbit:Manon(if she is infact 3 years old as in 11 years younger than adrien who is tiger) Dragon:Nathenial
Snake:Luka(Luka is definetly older than all of marinettes classmates and if the theory is correct he would be 17 because we know adrien is 14 and in chinese zodiac snake is 3 years older or 9 years younger than tiger)
So if Manon's age is infact 3 then we would prosumably a really solid theory