Powers • Collar (Powers) • Scratching post • X-Rays • Family (Tuttankitty) • Catnipians • Inventions • Kat Nebula

Coop Burtonburger • Burt Burtonburger (Rat) • Millie Burtonburger • Grandfather Burtonburger • Grandmother Burtonburger

Old Lady Munson • Growler • Dennis • Phoebe • Henry • Lorne • Harley • Dennis' Mom • Captain Blasteroid • Mr. Gerber

Bruiser • Pet Doctor • Kat's Girlfriend (on episode "The Kitty Vanishes")

Fiona • Mr. Cheeks • Kat's Girlfriend • Spybot • Buck Diamond • Lloyd • Kyle Dustin • Estelle • Aunt Beatrix