I Got 2 1/2 on the mind:

Xiangfei: plainly-put: She's SNK's MGK to Capcom's Eminem (Chun Li). I love the costume and the concept, but SNK had a subtle obsession with trying to create a heroine to rival Chun Li's mystique and legacy. Xiangfei is fast, decent ground-to-ground attack and supers and her 'dumpling' niche. Unfortunately, that made her a bit too derpy and Elena can out-eat her =P

Speaking of SFIII: Makoto's only defining moment and legacy was that she was the only Street Fighter heroine at the time to out-chest Chun Li. I'll leave it at that =P

Dishonorable Mention: Everyone from World Heroes 1. If Street Fighter was hip-hop, then World Heroes is mumble rap over recycled beats and stolen Rakim lines