Stimpson J. Cat or Stimpy for short, is one of the two protagonists of The Ren & Stimpy Show. He is a fat, red and white, rotund cat, with a blue nose, purple eyelids, no tail, human-style buttocks, flat feet and a brain size of a peanut (despite some intelligence, such as cooking and inventing; he is also a talented musician), Stimpy is idiotically yet adorably cheerful and completely devoted to Ren Höek, as he is, to him at least, a good friend. However, Ren abuses Stimpy constantly with both physical and verbal abuse. His trademark facial expression is a blissfully ignorant smile with tongue flopping out.
Stimpy is named after an art school classmate of Kricfalusi, whose nickname was "Stimpy Kadogan" (the classmate appeared in one episode as the wrestler "Killer Kadogan", and in the "Craftwork Corner" segment at the end of "A Scooter for Yaksmas", Stimpy is actually referred to by this name). He was voiced by Billy West in the original series, the albums, and Nicktoons: Attack of the Toybots, but has also been voiced by Eric Bauza in the Adult Party Cartoon episodes and Nicktoons MLB.
Stimpy has appeared in an episode of "Drawn Together", where Billy West reprised his role from the original series.