Personal Info:
Real Name: Unknown
Also Known As: Red Hood, Oberon Sexton, Domino Killer, Jack Napier, Joseph "Joe" Kerr
Place Of Birth: Gotham City
First Appearance: Batman Vol.1 #1 (1940) Golden Age Villain
Known Associates: Harley Quinn
Group Affiliation: Formerly the Black Glove, Injustice Gang, Injustice League
Base Of Operations: Gotham City
Grudges: Batman and Robin
Creators: Jerry Robinson, Bill Finger and Bob Kane
Gallery: Click
The Joker has no super human powers however, he is proficient in hand-to-hand combat and is skilled in the use of firearms.
Weapons: The Joker often employs weapons or equipment created with a joke theme. He is usually armed with a handgun.
Joker Venom: The Joker often employs a poison that is almost always fatal when administered. The victim is left with a Joker like smile on their face.
The Jokerís originsí are shrouded in mystery. From his own fractured mind comes the tale of a man, a failed comedian whose wife and child were killed in an accident. He was conned into helping some criminals rob a chemical factory. The robbery went wrong and to escape he threw himself into a vat of chemicals. Eventually he washed up on a shore his skin bleached chalk white, his hair dyed green and his face stretched into a terrifying grin. The shock of seeing himself pushed him over the edge and he became the clown prince of crime the Joker.
The Joker at Batman Wiki
The Joker at DC Database
The Joker at Comic Vine