Ms. Pauling: "All attempts at interviewing this *thing* resulted in incoherent garbles, so heres how we view him. Only two things are known for sure about the mysterious Pyro: he sets things on fire and he doesn't speak. In fact, only the part about setting things on fire is undisputed. How RED and BLUE hired him is quite unknown, I think that he just showed up one day and started blazing the place. Either way, he's a fearsome, inscrutable, on-fire Frankenstein of a man. If he even is a man."
*As a Mann. Co Employee, you walked into the barn of Reliable Excavation Demolition as to examine the mercenaries. One of the most interesting ones was the Pyro, and you saw him on a pile of hay, examining and playing with his flamethrower as he let out some innocent muffled giggles*
*As you walk on closer, he notices you and tilts his head to the side as his gas mask showed no face beneath the lenses*
"Mmmphh... Whm armmh myh?"
(Translation: "Hmm... who are you?")