Bison has been the most fleshed out of all the rest. Vega possibly second most fleshed out villain in the serie but the rest havent had much character exposition aside from the usual "Im gonna smash your face in" I guess capcom needs a better script for their next villain......Oh wait Juri would have been a great potential villain if it werent for her single lined storyline - lack of appearance in the comic but the second movie really boosts her up.
I would argue that Sagat has the most fleshed-out story. Dan's dad, first tournament, losing crown to Adon, regaining crown, purposefully losing to Dan, change of purpose... I feel like he's had the most development.
Dude AKuma, i really dont even have to say much, Raging Demon is his most powerful move and it ends the round INSTANTLY...and its called the Raging Demon....i love me some Bison, but Akuma is evil...pure unfiltered EVIL.
For me it is Akuma. I love to play him and I like his orgin. He is portrayed as overpowering. Like no one could ever beat him. But he is not as powerful as a metaphysical being. He has a power that can be reached with ruthlessness. I like that thought. I think that is why I like Marvels Magneto so much. I have the same feeling with him. By the way, Akuma is invincible, but I lost hundreds of times while I was playing him