Pipsy is a player on the Diddy Kong Racers team on the multiplayer Wii sports game Mario Rugby League. She is a fast character with average skill and poor strength. Her special skill is to launch a homing missle as an extended tackle.
Pipsy appeared as a supporting character in the Nintendo Wii platforming game Timber's Island. Pipsy decided to move to Timber's Island after Wizpig invaded because it was such a nice place. However when Captain Blackeye invaded the island she jumped into action with her friends. She gave Timber Karts, Plane and Boats whenever he needed them.
Astro Mouse is an orangey-pink coloured mouse and was the prototype character for Pipsy. Astro Mouse was to debut in the Nintendo 64 game of the same name, however the game was cancelled. Later, while looking for another character to appear in Diddy Kong Racing, the developers looked at Astro Mouse. However, they thought that his bulky clothing and nasty snarl wouldn't quite fit in with the rest of the playable characters of the game, so the art director of Donkey Kong Country and Diddy Kong Racing, Kevin Bayliss, redesigned him: changed his clothes, personality, and did a little gender swapping. Eventually, Astro Mouse got changed into Pipsy. The two characters are sometimes considered as two individuals, however, as is the case with Diddy Kong Racing 3DS, where both are playable characters.