Won't be a problem at all~.

[Joker is used to more than his fair share of odd ducks, so he doesn't find this too strange. It's actually fairly amusing from his end.]

My advice is to keep it simple, don't want to get too wordy now. Name 'em after something he's good at, or that he reminds you of. Fer example, I knew a talented guy who was good at throwing knives, so called 'im Dagger! What's yer friend like?