(You may be looking for Zero (KOF))
Zero is a Maverick Hunter from the Mega Man X game franchise. Zero has also appeared in Capcom's Tatsunoko vs. Capcom and Marvel vs. Capcom fighting games, as well as (after a redesign) his own game franchise, Mega Man Zero.
Zero defeated Mudman in the first round, Galford Weiler in round 2, and Yuki in round 3, but was eliminated by Haohmaru in round 4.
Mega Man X & Zero were eliminated in the first round by Mace Windu & Kit Fisto
Zero defeated Pikachu in round one, but was eliminated by Sagat in round 2.