9. The Three Jokers
We don't really know much about this YET, but in DC Universe Rebirth #1 it is suggested that the Joker is not merely one man. Instead, it is claimed that there are actually three Jokers who have been wreaking havoc, bringing Gotham to its knees.
However, an explanation will soon be forthcoming. Writer Scott Snyder said: "Geoff [Johns] was great about walking us through what the plan is for upcoming ‘Three Jokers’ storyline and giving us the breathing room for what we wanted to do.
Just to be clear to readers, this is not going to answer the ‘Three Jokers’ question, that’s really for Geoff — he has a big story planned for that — but what it will do is show us the way that The Joker, like he did during my entire time on Batman, is always there as the Greek chorus of the book, saying to Batman, in one way or another, ‘You’re doing it wrong,’ or, ‘You’re doing it right. This is what needs to happen. This is who you are.”
Ranking explained: It ranks low because we still have not got an answer and the theory has never really been explained. When that changes, however, it should certainly climb towards the top.