he who draws large men

He comes from a family of incredibly powerful Djinn. They're known for their most impressive techniques of shadow-weaving/walking, massive shapeshifting capacity, and summoning of lesser (but still powerful) spirits. Of course, he didn't get any of these. Rather he just has the terrible strength and an adamant refusal to be killed. Because of his lack of genuine "magics", his family had attempted to wipe him from the face of the planet quite a few times as he grew. He wasn't worth anything to them without their abilities, after all. They accidentally created a monster beyond their comprehension with this behavior, in the form of an unwavering, unrelenting, brutal being trapped in a shitty mortal form he dislikes without any qualms for risking his own life.

So now, Toji holds the title of hunter, hunter of those deemed deities by humans and hunters of "monsters". He's got the blood of ancient beings on his hands, and he won't stop until he slaughters the last of the highest beings that have influenced mortals. If they couldn't accept them, then he'll just have to rip them all apart at the seams (and make cash while he does it.)

Speaking of his job, he sells parts of the beings he kills to humans. Furs, skins, scales, bones, teeth, relics, and more. He collects them all himself, which satiates some weird desire he has, to feel as if he's getting his "trophies" fair and square. He's got many human buyers, as he consistently came through with increasingly valuable items.

Tattoos/markings on Djinn normally signify what their capacities are for magic, but Toji's don't glow, and are a different color than the rest of his family. They're not traditional markings either, so they look a lot more like tattoos on him. He's also lacking in the gradient skin color others in his family may have, alongside having scarring that most wouldn't accumulate or keep the way he has. This helps him pass as a human. He's got a foot in both worlds and belongs in neither.