Tatsunoko vs. Capcom Cheats

Second Character
Hold the partner button during the character introduction sequence prior to the start of a match to start the match with your second character.

Secret Characters
Unlock secret characters by playing Arcade mode repeatedly and collecting enough points to spend in Shop.

Hakushon Daimaou: Clear Arcade mode once, then purchase him for 1000 points
Ippatsuman: Clear Arcade mode thrice, then purchase him for 2000 points
Saki Omokane: Clear Arcade mode once, then purchase her for 1000 points
Viewtiful Joe: Clear Arcade mode thrice, then purchase him for 2000 points

Easter Eggs: Credit Doronjo Mini-game
When the credits roll, press A, and the black background will change into a barebone platformer, in which you control Doronjo and her subordinates.

Secrets: Post Match Movement
After you win a match and You Win comes up on the screen Press the + button on the wii remote to gain control of your character again.