The glass cat with emeralds for eyes in Oz. She is very proud of herself but at one point gets covered in mud as punishment!
I didn’t remember it having a name, but apparently it’s Bungle.
DC aka Darn Cat of the Movie That Darn Cat
I was thrilled as a kid by Zunar-J-5/9 Doric-4-7, The Cat From Outer Space.
Senator Joseph McCarthy was illustrated as a cat, when satirized by Walt Kelly in Pogo. Does that count as fictional?
Haviland Tuff’s psychic cat Dex
Doctor’s Claw’s M.A.D Cat.
It was Tuf, and Dax; see post 25.
The cat General from the last segment of the Stephen King-written anthology film Cat’s Eye. It’s the only time I can think of that the cat gets to be the hero instead of the villain!
Another I can think of is the character Jemima from the stage musical Cats. More specifically when she was portrayed by thelovely Veerle Casteleyn. Schwing!
Dittos for Pete, from Door into Summer, Greebo and Maurice from Pratchett, and Tobermory.
Adding the cat from Fritz Lieber’s “Spacetime for Springers” That story makes me cry.
Also Oliver, the cat in Vivian Velde’s YA novel, A Well-Timed Enchantment.
The King of Cats.
Cat from Red Dwarf. I like a cat with style.
and Puss…in Boots!
That’s what happens when you go by memory after turning 50.
Koko and Yum-Yum, from The Cat Who…series of books.
Wasn’t there just some hub-bub about referring to Ceiling Cat as fictional?
While I am sure that’s a real cat in dropping in through a ceiling tile, I’m just as much sure that he’s not watching me masturbate. So 50/50?
Shhh! 
Mr. Bigglesworth.
Madcat, Dr. Claw’s pet from Inspector Gadget.
Picky-picky from the Ramona book series
Oh, hell yeah.
Does C’mell count as a cat? If so, C’mell.