As for my Vote i'd say the Lizardguy, i think his animality is perfectly complemented by his choppy and rampant fighting style. He has few strings and even most of those look pretty choppy and often his moves look like he's exaggerating them and can barely stop his momentum.
He is also very well designed visually.
And...
He can bite you in the head! I mean, how cool is that?
Nighty, because everyone know the story has been wrongly translated, and that Nightmare is the good guy who want to save the world =D
Zasalamel would be second, cuzz he rocks =D
Talking of Rocking, Rock would be third, CUZZ HE IS MANLY!
Sieg wins my vote because he is my main and I like his style and because lets face it... he is a very good looking character. He is like Jin an avenger that all the girls are gonna droll over but they can never have him because he is too bent on his goals to even notice or care.