BLACK POWDER:

The No. 8 ranked Crossbone and their dedicated infiltrator and saboteur. A strange, not quite human girl from the world of the Artifact Seeker manga series, a series taking place in a world of near-endless oceans with various islands in archipelagos throughout, each one vastly unique and different and possessed of its own unique secrets and treasures - of various types, both literal and not, and the Seekers who go from island to island in order to seek out and find these artifacts. Named Kuroi Kona, she was born to unknown parents on an unknown island - all that's clear is that whoever they were, they did not care about her, as shortly after she was born they took her and sold her off to a boatman to abandon on the artificial island of Scum City - a massive island of waste and trash that eventually became so large and compact that a society of exiles and the abandoned grew to develop there, a place where those who are hated by society are left to live and die far from their eyes, and where the young Kona spent her developing years, living off trash and mutated sealife and trying desperately just to survive - it was a miracle she even survived considering she was abandoned as an infant. As she grew, she came to survive mostly by stealing the fortune of others, owing to a mysterious power she had developed - a Delta Force, as they're called in the scientific community of the setting - specifically, hers allowed her to generate explosives from effectively nothing by burning her regrowing fuse on top of her head, which she used to develop a strangely loud and proud method of "thievery" by blasting her way in, taking what she wanted, and getting out of dodge right after. However, despite this, what she wanted most was to experience the world outside her island prison, having learned of its wonders via various washed up newspapers, magazines and books that had ended up in Scum City. Thus, one day she hatched a plan - one which she got lots of support from her fellow Scum Citygoers, half due to the sort of bond she had developed with them, and half because they wanted her gone so she'd stop stealing their stuff, and made a daring escape using a rockets propelled by the explosives Kona could generate, and she soon achieved what she wanted, having gained a ship, going from island to island, experiencing what they had for her, and stealing what she could - same loud style as always - coming to be known as the legendary thief, Black Powder. However, in the end she was still quite lonely, only realizing she had abandoned her friends in Scum City long after she had left, and wanted more than anything to develop new bonds with people - so when a strange letter offered her friends she could rely on more than anything, she took its offer in a heartbeat.