5. Dinnah, Dinnah, Dinnah-Dinnah Alf-Man!
I'm pretty sure this is exactly what Warner Bros have planned for the next Batman movie, replacing outgoing hero Bruce Wayne with another outsider who would know exactly what the character needed.
6. Utility Belt
Because no Batman fan should be without his Bat-gadgets. I can't work out why you would go to the effort of getting this sort of tattoo without going through with it entirely and getting it all the way around. Unless of course he looked down as the "artist" was working on the front, and decided that less would definitely be more.