Mister Mosquito
# A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
Mother Mosquito
At the character selection screen, hold L1 and press Up, Right, Left, Down, Square(2), R1(3). If you entered the code correctly, you will hear a shout.
Father Mosquito
Enable the "Mother Mosquito" code. Then, hold L2 and press Up, Right, Left, Down, Square(2), R2(3) at the character selection screen. If you entered the code correctly, you will hear a shout.
Two player mini-game
Hold Start + Select on controller two after turning on the system. Press Square to move forward, X to jump, and Triangle (when the power meter is full) to do a super attack. Alternately, hold L2 and continuously rotate the Right Analog-stick clockwise at the title screen.