Mr. Mistoffolees
Mr. Moe
Mr. Mouse
Mr. Moustache (after the song by Nirvana)
Mr. Neo
Mr. Newman (after Victor Newman from The Young and the Restless)
Mr. Nibblesworth
Mr. O'Mally
Mr. Peepers
Mr. Pi
Mr. Pickles
Mr. PoPo
Mr. President
Mr. Puddy
Mr. Purrbody
Mr. Purrfect
Mr. Pussy
Mr. Roosevelt
Mr. Sandman
Mr. Scarfies
Mr. Sleepers
Mr. Sleepy
Mr. Snickers
Mr. Snuggle Bum
Mr. Sonny L. Burke (L. for "louse")
Mr. Sox
Mr. Spaz
Mr. Taz Man
Mr. Tibbs
Mr. Tickle Bum