How about:
Snowball (good for a black cat)
Cat Astrophe (maybe Astro for short?)
Twinkletoes
Grits (as in 200 grit sandpaper)
My kids brighten up our home. They never turn the lights off. -A Wallyism
Spot, Rover or my personal favorite for a cat, Target.
Hm. Under shows a lot of promise. His last name can be Foote.
My all-time favorite cat anme, though, is Stain.
A committee is a lifeform with six or more legs and no brain.
Cthulu?
All you need to start an asylum is an empty room and the right kind of people.
Impressionist music lover? How about Claude Depussy?
Wiccan devotee? How about Pywacket (or Alestair Meowley)?
I like “Chthulu”, but I don’t know how to pronounce it. And then there’s the whole issue of calling him.
I think he’s staying Under for now. Last name Foote, as suggested above.
Call him Karma.
That way when you scold him you get to yell Bad Karma!! Bad Karma!!!