Waking Nightmares: The Lost Soul of Fire

The crazed female arsonist of the BLU team! (Most of) her teammates do not know of her gender until they arrived in Equestria believe it or not. As a unicorn, Pyro has the ability to conjure up and manipulate fire and even cast airblast spells. She is also in a relationship with the BLU Engineer and happens to have some kind of traumatic past which lead her to become what she is now.

If I'm correct, the gas mask works in conjunction with the oxygen tank that's supposedly on her back. But since her mask is gone, the tank is gone along with it. Plus, she retains her immunity to being set ablaze and is resistant to heat-based attacks.