Secret Characters:

Beat the game with all 10 fighters and save your 
game. Go to Fighter Select screen and keep pushing
left or right until you see Cao Cao or the other 
secret fighter (you cannot see the icon to select 
them).Then beat the game with Cao Cao and the other
figher. Save or don't save the game and go to the 
Fighter Select screen and keep pushing left or 
right till you see Lu Bu.