By and far, Alucard. No question. Soma and Hector each may have been powerful in their own right, and they may even try to emulate the son of Dracula's in look, hair and fashion sense. But in the end, each gave up their accumulated power at the conclusion of their respective adventures. - Soma's Power of Dominance being put to rest, and Hector forfeiting his abilities over Devil Forgery. Meanwhile, Alucard retained every ability, discipline, and experience from his personal battle against his father. And come on. - At Level 99 with the biggest sword in existence and the toughest magic backing him up, who's you're real daddy CastleVania? ^_^