User:TheBeastWithJustOneEye2

MY FAVOURITE VILLAINS IN NO ORDER
Bill Cipher: A powerful demon that was given personality and a sense of humor, and some charms that make him great. Sometimes, simplistic designs can make good villains.

Gideon Gleeful: Before The Beast with Just One Eye arrives, we need a villain to assume as a Big Bad. And Gideon has done a pretty good job on that.

Professor Pericles: Small parrot with high intellegence and mastermind behind many events of the show. But too bad he is no longer evil. Some villains need to stay evil.

Katz: An evil cat.

The Joker: I like this version most due to we see him from episodes to episodes (he is the main antagonist of the series after all), not appear in only one time only to be defeated. Also animation is way better.