Welcome, Lee! I'm Heather and I have three characters here.
The first is this guy (and sometimes girl), Kurt/Mina Wagner. It's not a personality change. He just finds it easier to go by a girl name if he gets stuck in lady form. Kurt has pretty much the same exact history as the comics but this time he has Morph's powers which means he's an omnimorph with a lot of time on his hands, the ability to fly and hyperdrive hormones. Aaay. Kurt'll be with him on some of that summer tutoring as he's NEVER actually been to school. This is his first time. And he totally gets that attempted murder thing.
The second is Heather Cameron geneticsecurity with Cipher's powers which means invisibility, phasing, etc. She's been at the school about 7 months and works security. Most people don't know she even exists despite all that. Heather also gets that attempted murder thing. Although her's was mostly being tortured... So there's that. AAAAY.
The third is the recently introduced Megan Gwynn fearstophobias who has Trauma's powers meaning fear-based shapeshifting. You afraid? Around her? She knows and now she's going to be your worst fear come to life to make you suffer. She's definitely NOT her usual self. No perky cute pixie girls here. She's been sent to multiple mental institutions, including some for the criminally insane, locked in isolation and killed a fair handful of people. She didn't start off cray-cray but she is now. She isn't at the school just yet. Working that out.