Say what you want about Todd Phillips' Joker, but curiosity and fandom don't power you to over a billion dollars. It takes a character who taps into the zeitgeist, and as time has gone on, Batman's arch-nemesis has constantly threatened to overshadow the Caped Crusader. Like Batman, Joker is a pretty malleable figure. There are some baseline rules in terms of his appearance and demeanor just like modern Batman needs a cape and a cave, but recent popular iterations have seized on how he reflects times of crisis (The Dark Knight) or the shortcomings of society (Joker). …