Joker (DC)

The Joker is one of the main antagonists of DC Comics, most recognizably being the archenemy of Batman, having been directly responsible for numerous tragedies in Batman's life, including the death of Robin (Jason Todd, formerly the 2nd Robin, currently The Red Hood) and the paralyzing of Barbara Gordon (formerly the Oracle, currently Batgirl), although she regains use of her legs in “Batman Beyond”, and was generally one of the most infamous of Gotham's criminal elements. In the comics, the Joker is portrayed as a master criminal whose characterization has varied. The original and currently dominant image is of a highly intelligent and manipulative criminal with a twisted and sadistic sense of humour.

Why He Rocks

 * 1) He's one of DC's (and comic books in general) most iconic and dangerous supervillains. (Next to Red Skull from Marvel's Captain America)
 * 2) He's also one of the most recurring villains in the series- he's been around since the 1940s, and he's still well-remembered today.
 * 3) He doesn't have superpowers like most of Batman's Rogue Gallery, but he is a mad man who enjoys chaos, and managed to be a very dangerous threat.
 * 4) Aside from being an extremely serious villain, he also has several different personalities, to usually benefit him.
 * 5) The Joker had many memorable movie/TV  counterparts. The wackiness of Cesar Ramero, the innocence of Jack Nicholson, the insane criminal as Mark Hamill, the gritty nature of Heath Ledger, and a broken man against society as  Joaquin Phoenix.
 * 6) All it took is one bad day to reduce the sanest man alive to lunacy. That's how far the world is from where I am. Just one bad day.

Bad Qualities

 * 1) He had a toxic relationship with Harley Quinn.
 * 2)  heavily criticised for his lack of personality and charm for the character.