Soul Calibur II and III:
Anyone really. Except Astaroth, and Necrid. For the most part they are all freaking great. If I had to narrow it down: Mitsurugi, Raphael, Killik, Talim and Maxi

Tekken:
Lee, and Lee alone.

SSBM:
Link, Young Link, Marth, Sheik

Street Fighter:
Ryu

Mortal Kombat: (2d only please- the 3d ones only bring sad memories ¬.¬)
Liu Kang, Sub-zero (gotta <3 cheesy freezing moves!)

Guilty Gear (wow, my thumbs hurt just remembering it!)
Chipp, Ky, Sol