This is my top 10.
1 - Rei Ayanami (Evangelion)
2 - Kula Diamond (K.O.F.)
3 - Misato Katsuragi (Evangelion)
4 - Mai Shiranui (Fatal Fury, K.O.F.)
5 - Luise Meyrink (K.O.F. Maximum Impact 2)
6 - Sakura Kasugano (Street Fighter)
7 - Jill Valentine (Resident Evil, Marvel vs. Capcom 2)
8 - Nagase (K.O.F. Maximum Impact 2)
9 - Soryuu Asuka Langley Zeppelin (Evangelion)
10 - Chun-Li (Street Fighter)
Special mentions: Lien Neville (King of Fighters Maximum Impact 2), Hotaru Futaba (GAROU), Meia Gisborne (Vandread), Yuri Sakazaki (Art of Fighting, K.O.F.), Psylocke (Marvel Superheroes, Marvel vs. Capcom 2).