Gumbo

Kind of a villain. Kind of a wild card. His original role in the Luka the Great universe was as Luka's nemesis, a brute who uses strength instead of wits and loves taking what's not his, but he ended up siding with Luka when it came to destroying the Sea Ninjas (which Luka did not pick up on in time, resulting in him leaving Gumbo with a cheek scar).

He also turns up as an ally again in Trapjaw the Terrible, so maybe he's been having an offscreen change of heart.