Batman is Gotham's greatest villain. Gotham City is under the protection and defense of The Dark Knight. ... The Batman abides by a strict moral code that has allowed some of DC's most notorious villains to terrorize the citizens of Gotham.

Who is the main villain of Batman?

That, and the fact that the character is quite scary, have made The Joker Batman's arch nemesis since he appeared in Batman comic #1 back in 1940. Really, The Joker and Batman have been linked together since the very beginning.

Is Batman ever evil?

There are times, however, when he failed to uphold his own virtues and rules. In fact, there are plenty of evil versions of Batman. Most of them are other people who simply took the cowl and mantle. A few of them, however, are versions of Bruce Wayne himself succumbing to the most primordial of human crimes.