Ryu , I'm terrible at this game so I always pick him because his moves are straightforward (10 years of practice doesn't help and doing constant hadoken still hurts my hand on the PS2). The trailer for Street Fighter IV looks cools though.
Rolento. He plays so differently from everyone else and it takes a while to get used to how he plays, but he can adapt to different characters pretty easily. Ken for 3S. Obvious reasons why.
You're a Kara Targeter aren'tcha? lol. Yun FTW always. I will juggle you until KO. Or I'd give you the beat down with Sean. hahaha. SFIV. It's Gouken FTW. FeiLong for fun. Ryu sucks. Rufus is like a fat Yun.