Unlock Miss X
Fight 100 matches or collect all the items in the game.

Unlock Whip		
Complete Q.O.F mode with each of the original 8 fighters.

Unlock Yuki		
Complete Q.O.F. mode with any fighter.

Cause a Weird Animation
In a Battle Push Left+Option and a strange animation will occur. Each Character has a different one.

Fight Yuki
Get at least 3 super finishes within the first six stages. Yuki will then challenge you after stage 6.