For the longest time it was Joe Higashi, but now it's nobody in particular. I just like so many of them too much to decide. Geese Howard is certainly a strong candidate I think, as I've got his '96 music playing while I type this, but others like Kim Dragon, Susano, the brothers Bogard, the Sakazaki clan, Rugal B. and Goenitz probably make out the top ones, along with Billy Kane and some other notables like Haohmaru.
Decisions, decisions..... (aren't always for me.)