Little man, Mister, and Monkey... Although, the second one confuses the cat as his name used to by Mystery (now Smudge), and the last confuses DD as I've always called her a monkey as well. Heck, my parents used to call my brother and me monkies all the time, so it's kinda a tradtion.

I also call this one "you pain in the butt!" since he likes kicking my ribs whenever I twist to the left. Every time, without fail. So he's my little pain.