Her name is Teaion
She doesn't have a catchphrase currently, but I could see her saying something like, "You guys don't understand, I really just don't care about any of you." I don't really know, you can play around with it if you'd like! She's got a bit of attitude, and gets lost in her own world a lot.
If you'd like to color her, that would be great, but there is no need to go out of your way to do so! Try what you want! :)
Personally, I like alcohol markers the best, even if I'm not that great at them