1. Joker

There is no doubt that everybody fears a madman, Batman included. So, when you have Joker as your formidable villain, there is absolutely nothing that you can do to stop this character from becoming one of the most favorite villains in the Batman series.

What makes this character so dangerous is the unpredictability that comes with this character, the typical appearances, and what seems to be the manic patience of a person to absolutely take care of Batman in all possible harmful ways.

Yes, the Joker, as it seems is a person that not only likes jokes that are a bit dark in nature, but also happens to be a person that is truly dark in all the wrong places. Harley Quinn is sometimes the Sidekick of this character, but then Joker has been known to work his best when he’s alone, and can concentrate his full effort on taking down Batman and ruling over Gotham.