Well, obviously Mario. It's raked in the most cash, it's the oldest, and it's the best. I mean look now. Mario been in almost every kind of game I can think of. 1st-person shooters, puzzles, golf, tennis, sports like that, and platformers!
Street fighter is my favorite. It didn't really branch much, it went into the marvel vs capcom, and just later generation games of the same thing, but I feel the originals where the best. Super Street Fighter 2 was my fav!
I have Suoer Mario All Stars, which is a good game and it is also rare. I think It's for the NES. and I still have my Dreamcast and the original Atari.
I'd have to Wolfenstein, (Does that count?) Because it was the first FPS. Without Wolfy, we wouldn't have Halo, Resident Evil 4, Call Of Duty, Medal Of Honor, Fable, Resistance, and thousands more.