Don't forget:
Madara, the man with a whole face on his chest (not a tattoo, a real face).
Danzo, the man with 10 eyeballs and a face on his arm.
Obito, a masked man whose arms can just casually fall off and ooze white goo (and he just says "oh well. I'll get a new one").
Zetsu, a two faced artificial plant human creature.