Gunpowder is a character from the former PMD-Explorers group on DeviantArt. He is allegedly a former pirate; however, this is possibly a fabrication to hide former gang ties. He is the leader of the Rogues guild, alongside Devonshire.

Canonically, Gunpowder is a trans man. His owner is Latiass.

From http://papayakitty.com/wiki/Gunpowder (archived link) -

"Gunpowder the Gabite is the questionable leader of the Rogues. Sassy and powerful, he does much of the gruntwork needed to further his yet unknown goals, trusting the direction of his partner Devonshire. Being known as quite the liar, his background is as of yet a mystery, with the only certainty being that he was at some point a pirate on the open seas.

He is rather abrasive at the best of times, but as many guild members have discovered, he is especially so about certain topics. One such subject is his back "fin". Some have claimed that a male Gabite should have a chipped fin, but Gunpowder is quick to dismiss such claims, saying "I take good care of meself," and that these claims are without any basis to begin with, due to a lack of other Gabite for comparison. Another touchy subject for Gunpowder, although less so, is the topic of "evolution". Gunpowder has a sort of hatred towards Garchomp in general, and is disgusted by the idea of becoming one, although his reasons are unknown."