Top Cat or "T.C." is the titular leader of the gang. He is a confidence man (conman) who often swindles those around him, including his gang and Officer Dibble. He is voiced by Arnold Stang in the style of Phil Silvers.
T.C. is a creamy yellow-furred alley cat with a white muzzle, four whiskers, and a rather long tail. He usually wears a Tyrian purple vest and matching pork pie hat. Though his eyes are colored a stylistic black in the series and official art, he implies that his eyes are a golden color.
He is a rather greedy, smooth-talking, and facetious cat, though often incredibly lazy and will attempt anything to make a quick profit without actually getting a job. T.C. is almost always able to worm his way out of trouble, often by tricking or otherwise flattering Officer Dibble. He is quite clever and has a great sense of humor, often coming up with schemes on the fly, and is considered to be wise by his gang. Though he often takes advantage of or tries to take credit for the achievements of his peers, he does often respect the efforts his gang go through for him and genuinely cares for them and their well-being.
Grandma Cat is Top Cat's grandmother. He has told her that he is a police cat.
Myra is Top Cat's sister, mentioned in the Big Golden Book Top Cat story. TC thinks that she is a worrywart, and he tells her that he is rich and lives in a mansion because he fears that she would never sleep again if she knew the truth.
Myra's son and Top Cat's nephew. Sheldon looks up to Top Cat quite a bit. TC is a little protective of the kitten, and is saddened by the idea of letting Sheldon down. When Top Cat thinks he is in trouble, he asks Sheldon not to think too harshly of him.
Cousin Shifty is Top Cat's cousin and ex-coworker. Top Cat doesn't seem to like Shifty very much. When TC is informed that Shifty is coming to visit he gets somewhat upset. While Shifty is excited to see his cousin, TC is just irritable and impatient.
- There appear to be special holes in Top Cat's hat for him to poke his ears through.
- His birthday is 5 February.
- In "The Unscratchables", he and Benny the Ball briefly talk about how they met each other in the Boy Scouts.