SF2 would probably be an all time favourite though I havent played a fighter in years, the seperate endings for each character was a real treat and kept me spending until I managed to finish the game with each one. Never really had a favourite character (maybe Vega at a push), Ken was the toughest imo but they were all fun. Only thing was I was never very good at the special moves, I wasn't a button masher it's just that while friends had them working like clockwork I was never quite sure, never seemed to hurt me though I was always just a little less predictable
Going back even further Barbarian (Death Sword in the US) was a sword fighting game for the commodore64 that was fun, had suprisingly good game play and the ability to cut off your opponents head.