#literally zero

Amelie's story is that she is supposedly the last turtle yokai, taken by Big Mama. At first, when she was very little, BIg Mama was very kind to her, but never bothered to name her, calling her Pet, or referring to her as "it", which just stuck. Big Mama's assistant, who I headcannon as Venus de Milo, while thinking of Pet as a sort of sister figure, felt inferior to her because Venus is a mutant, not a yokai, which Big Mama holds over Venus.

When Pet turns 11 years old, she fights for the first time in the Battle Nexus. Big Mama starts her off in basic bouts of skill, but by the age of 13 is already fighting in the major battles- the "to the death" battles. She quickly becomes the Champion, and Big Mama often shows her off to others in her social circle, and that's when she dresses up like she is in the picture. Pet becomes nonverbal during this time period, she chooses not to speak because she is afraid she'll say something wrong and be punished.

When she turns 18, however, she starts rebelling against Big Mama, and so BM locks her up like she did with Splinter. (Ergo how Leo was able to become Battle Nexus Champion).

A year later, when the turtles are looking for their lost siblings, the group who goes after Venus also find Pet, and take her in. She easily slips into the role of "older sister of now six turtle mutants and two humans". I think it should be fitting that Venus give Amelie her name, after they have a heart to heart convo.

She teaches her siblings to speak her particular dialect of turtle (the difference between hers and the sibs is kinda like the difference between American English and British English lol), and the boys teach her (and Venus) TSL.

It takes her a while to talk again, and when she gets her voice back its deeper and raspier than it would've been normally, but the sibs like it so she doesn't really mind. She learns Japanese, Spanish, and French very quickly. When she is overwhelmed, though, she quickly defers back to chirps and churs because it's easier for her (it does make it hard for her non turtle family to help her out though, especially when she says more complex things in her native dialiect)