The Tanuki suit is an easter egg that is devoted to the illustrious tanuki and the famed Mario series. Like the other Scribblenauts Unlimited exclusives, it is found on all of the games for different platforms. The tanuki suit and the frog suit were both originally created to be an easter egg, as they could be seen in the E3 commercial. Afterwards, was when Fifth Cell and Nintendo created their special agreement.
The word tanuki is the Japanese word for "Raccoon" or "Possum".