The Joker (Titans)


 * "Bruce says the Joker kills people just because he can. He's never gonna stop."
 * —Dick Grayson to Donna Troy

The Joker is a psychopathic supervillain and archenemy of Batman.

Biography
At some point, the Joker was the cause of an incident in which a lot of people died, and while Batman and Robin tried to stop him, he managed to get away.

Abilities

 * "''Yeah, it's not fun. It's the Joker."

"Oh. Even Diana thinks that he's scary.''"
 * —Dick Grayson and Donna Troy


 * Intimidation: Joker has an infamous reputation for being a terrifying psychopathic murderer, to the point where the godly Wonder Woman fears what he is capable of.

Season 1

 * "Titans"  (mentioned)
 * "Donna Troy"  (mentioned)
 * "Dick Grayson"  (fake reality)

Behind the scenes

 * In the DC comics, the Joker is psychopathic super villain and the arch enemy of Batman.