Kung Fu Panda

Big Head
Go to the extras menu and then go to cheats and enter:
Down, Up, Left, Right, Right.

Infinite Chi
Go to the extras menu and then go to cheats and enter:
Down, Right, Left, Up, Down.

Dragon Warrior Outfit (Multiplayer)
Go to the extras menu and then go to cheats and enter:
Left, Down, Right, Left, Up.

4x Damage Multiplier
Go to the extras menu and then go to cheats and enter:
Up, Down, Up, Right, Left.

Invincibility
Go to the extras menu and then go to cheats and enter:
Down, Down, Right, Up, Left.

Unlock Characters
Go to the extras menu and then go to cheats and enter:
Left, Down, Left, Right, Down.