Benny, a blue-coloured cat with a white jacket that fastens with a single button at his neck, is T.C.'s right-hand man; they share a close friendship. He is short, innocent, chubby, and naive. His eyes are shown as black dots unlike the other cats who have white sclerae with black pupils. Benny may appear to be simple-minded, due to the fact that he always gives the game away, but he manages to ask the most logical questions during the gang's erratic endeavors. He also has a ready wit at times. He is the youngest of the cats, at 7 years old. A number of episodes have focused on Benny, including "The Violin Player", "The Unscratchables" and "The Missing Heir". He also made a cameo appearance on Kid vs. Kat in "The Kat Whisperer". Benny the Ball is modeled after his voice actor Maurice Gosfield in the TV series. He was voiced by John Stephenson in Yogi's Ark Lark, Avery Schreiber in Top Cat and the Beverly Hills Cats, and Maurice Lamarche in Harvey Birdman: Attorney at Law.
In the movie, he sometimes gets Top Cat and his gang in trouble, and his fandom of fictional musician Lazlo-Lazlo serves to introduce that character. In the film, his arms are slightly shorter and smaller, his voice, by Chris Edgerly, is a little bit clearer, and he is slightly more clumsy.