Alsherim - Character is a bit too old for the position desired(RA's tend to be only a year or so older than incoming freshman college students). Instead of moving his entire bio around to accommodate an age change, why not take a professor position or one of the other faculty positions? His secondary power limitation needs to be discussed a bit more, as it sounds exactly like what happens to normal musculature :p Other than those two minor details, the sheet is fine with me.
Howling - I see no problem with your proposed character. Upon secret's approval, I welcome you to the game !
Kendra - the metal shield, does it form a bubble looking thing around her, or does her skin turn into a metal, like the big colossus guy did? That's my only question that I could find before I give her the stamp o' approval.
Aiden - Lol. I love the character, has my approval. Upon Secret's approval, welcome to the game !
Rhedyn - Only thing that I could spot was the conflicting nature between being an "independent" and in the school's counselor position at the same time. Independents, by nature, don't really give a dam as to what happens, just as long as it doesn't affect them. She would be a bit better off swaying towards the Xavier faction is she's going to be advising for them, ya know?