Pyro is a girl
Proof, and don't feed me none of that "But there's a flowery purse in Pyro's locker so it's definitely a girl."
Wanna know why that purse is there? It belongs to Scout's mom, as you can clearly see her with it in Meet the Spy. The purse is in Pyro's locker because he was banging her something nasty with them thunder thighs of his and then threw her out with nothin but money for a cab and didn't even bother returning her purse.