The P-wing was a starfighter used by Mario before he joined The Super Smash Brotherhood. It temporarily turned him into a flying raccoon that could whack things with its tail. It is unknown how Mario managed to turn himself into a flying raccoon, but scientists from all over the galaxy are attempting to figure out the secret behind this powerful starfighter. It was one of the last ships in the "letter-wing" series. After it they went to ships shaped like Chinese characters. The first such being the 漢-Wing. Yeah, I have no idea how that worked.