I just came up with an idea for Ultimate Black Panther: what if it was Isiah Bradley, with a close origin to Red, White, and Black, but after he was used up and the formula was given to Steve Rogers, T'Chaka bought him (the group that makes the serum is "evil" and puts their projects on on a black market bid) and uses him as a personal guard and pawn in the super-human community?

T'Challa gets jealous of T'Chaka's (love, respect, etc.} for Black Panther and become the new Klaw, killing T'Chaka--Wakanda Wars--and becomes the ruler of Wakanda, but in a Doom-style position.