@Kreyhardt @borjengoh Thank you very much guys!
All week I felt like I had no idea where I was going with this concept still. Nothing had resonated with me yet... did some more characters and actually now I'm starting to arrive at a champion idea I like. Did some research into Aztec & Mayan deities and mythology, which put me on the right path I think. A lot of was triggered from the first sketch here, but going forward I definitely want to avoid the Disney-look of the generic shirtless Aztec dude.
Stuff I'm throwing around: He has a magic hook made out of obsidian and the night sky that can phase through reality to hook into the inner-essence/hearts of his foes to judge their souls. He judges people at all stages of life. I don't want him to be this crazy all powerful death god because I think that's a bit naff. He's not necessarily evil, nor good. Just a super cool dude with a job to do, sent by the gods. Maybe he's a demigod.
Keywords I'm narrowing down with: obsidian, weapon, mortal, gift of the gods, night sky/constellations, smoke, animal guide (probably a snake) turquoise, mayan shapes, mirrors