This might be an unpopular take : My Pyro isn't covered head to toe in burn scars. He does have burn scars here and there don't get me wrong, but she's not covered in them. She IS a competent pyrotechnician after all, he wears fire-proof protection for a reason.

My personal hc for Pyro's origins is that he was a firefighter arsonist (look it up, it's a real thing) before joining the gravel war.

I also love the idea of Pyro's gender being just as ambiguous without the mask so I made him look as androgynous as I could here.