A member of Top Cat's gang, he is a sensitive and pink cat, and the designated look-out of the gang. He's been seen playing a mean game of poker when not with the gang, and is presumably something of a card sharp.
Chooch is a flamboyant pink cat, with a cream colored muzzle, and a long, bushy tail. The tip of his tail is either white, or black, depending on the material. He also happens to be the tallest of the alley gang cats. He wears a white long-sleeve turtle-neck sweater, and is often depicted with angular eyes similar to that of a Siamese cat.
Choo-Choo is enthusiastic and devoted to T.C., even when he's clueless about T.C.'s ulterior motives and schemes. He tends to be a sensitive, hopeless romantic, however unlike Top Cat or Fancy-Fancy, Choo-Choo has no courage talking to girls because he is shy. He tends to be rather prone to anxiety and insecurity, often doubting himself when it comes to potential mates.
- He lives at the fire house as the fire house cat as seen in "Hawaii Here We Come".
- In "T.C. Minds the Baby" he claims that he has an older sister who has kids.
- It's possible that he's still dating Lola Glamour after the end of "Choo-Choo Goes Ga-Ga" based on a comment in "King for a Day".