The Joker

The Joker is a psychotic criminal from Gotham City. His appearance and personality is that of a clown, and he pulls tricks and assassinations that are deadly and clever. He is the archenemy of Batman, although he plays a minor role and makes occusional cameos in Teen Titans Go!.

History
The Joker was once a standard criminal who was foiled by Batman whilst in a chemical factory. During the struggle he fell into a vat of chemicals. This accident bleached his face white, dyed his hair green, turned his lips blood red, and gave him a permanent smile, transforming him into the Joker. His disfigurement also made him lose his sanity, and he would go on to become one of Gotham City's most feared supervillains.

Biography
The Joker only makes minor appearances in Teen Titans Go!, first in "Real Boy Adventures," cheering on Cyborg. He never has had a speaking part, also assuming minor cameo shots in a few episodes.

Physical Appearance
The Joker usually dresses in purple, custom made clothes. He has a light green undershirt and a flower, which shoots acid. He has white skin, a pointy nose, and green hair. His overall appearance is based on a clown, as his name implies.

Episode Appearances
Season 1
 * Tower Power (cameo on screen)
 * Sidekick (mentioned, cameo)

Season 2

 * Serious Business (Beast Boy dressed up)
 * Real Boy Adventures (debut, cameo)
 * Cool School (cameo on truck)
 * Yearbook Madness (referenced in yearbook)
 * Beast Man (cameo)

Season 3

 * 40%, 40%, 20% (cameo on cereal bowl)
 * Pyramid Scheme (cameo)
 * Batman v Teen Titans: Dark Injustice (cameo)
 * The Titans Show (cameo)

Season 4

 * The Streak
 * BBRAE (cameo as a painted face on a ferris wheel seat)

Game Appearances

 * Teeny Titans (Game)

Trivia

 * The Joker's design in this series is very similar to his design from The New Batman Adventures.
 * In the DCAU and many other appearances he was voiced by Mark Hamill, who is best known for playing Luke Skywalker in the Star Wars films.