The Joker and the Batman
The Joker rises above all other villains because he does not want anything.
Every villain wants something:
-Power.
-Respect.
-Revenge.
-Love.
-Wealth.
The Joker wants nothing.
Can you imagine encountering someone like him at your college? or your office? or your neighbourhood?
Someone hellbent on destroying the setting for no reason at all.
I'd be terrified.
and then I'd be Batman.