Catman is the superhero alter-ego of Adam West. He lived at his Stately Manor, but currently lives at "It's a Wrap" Retirement Community, both in Dimmsdale. He is a good friend (as well as a legal guardian) of Timmy Turner. He is a parody of the 1960s Batman who was portrayed in live-action by the great Adam West and of course directly based after Catman, another hero made by DC comics but had become a less prominent superhero and hardly known nowadays to the people of Dimmsdale.
He is the first person to guest star as himself in the show, The second one is Jay Leno.
In the series, He has brown hair, while in real-life he has white hair, due to aging.
He has also played a fictionalized version of himself in shows Johnny Bravo, The Simpsons, and Family Guy.
He died from leukemia on June 9th, 2017 at the age of 88 shortly before his final film, Batman vs. Two-Face.
In later episodes, he is replaced by Jeff Bennett voicing Cat-Man.
For more information on the real life Adam West, visit his wikipedia page.