How Is This Possible? (A Tmnt Fanfic)

4 girls meet the turtle.. Well 6 but they turned to the dark side.

Kitty: the hothead of the group, tomboy,and a cat mutant,goes through depression, and a orphan till we found her,also doesn't listen to my orders,sarcastic

Kassy:The smart intelligent one, tomboy,a cat mutant, and used to live alone till we found her

Rylee:she's the happy bubbly one, girl and tomboyish, loves to annoy kitty and is Casey's little sister, funny, g?oes to gymnastics

Dylan(me):kinda smart, good leader, has super powers thanks to kraang, and is April's little sister, going through depression,

Emily:pretty smart, funny, tomboyish and girly, popular, a couple boys in school like her, doesn't try to impress anyone

Shauna: girly girl, a little annoying, but a great friend, not very popular but kind to everybody that she talks to, and has quite a few friends.

All these girls meet the turtles but 2 of them turn on them and become part of the foot, but which ones is that?