From the Super Mario Wiki
Pipsy is a small, yellow mouse that appears as a playable character in Diddy Kong Racing and Diddy Kong Racing DS. Pipsy is also one of the characters helping Diddy Kong and his buddies save Timber's Island from Wizpig. She is one of Diddy's friends. She drives a pink vehicle and is tied with Tiptup (and Drumstick on the acceleration part in the DS remake) for best acceleration and handling. Her instrument theme in Diddy Kong Racing is a steelpan/steel drum.
Pipsy may also have been set to make a reappearance in the canceled game Donkey Kong Racing; as Taj the Genie, a character from Diddy Kong Racing was going to appear in it. It is also unknown if Pipsy was going to appear in Diddy Kong Racing's cancelled Game Boy Advance sequel, Diddy Kong Pilot as Krunch was.
The early "Astro Mouse" design.
- Pipsy's design was born out of a cancelled game project called Astro Mouse. After the plans to make Astro Mouse a full game fell through, its main character was redesigned by Rareware artist Kevin Bayliss and included in Diddy Kong Racing as Pipsy..
- ^ RareGamer.co.uk (Accessed on 01-14-14)