Just wait till Bat's and Supp's get a load of what I have in store for them.... HAHAHAHA
The Joker has no known super powers. He is extremely intelligent and has a firm grasp of chemical engineering and weapon design, which he uses to create various instruments of terror, death, and criminal hilarity, if only to the Joker. He is responsible for countless deaths and is a highly dangerous individual.
Here's the cold, hard truth Bats...I don't hate you 'cause I'm crazy...I'm crazy 'cause I hate you!
His mental state is completely unstable. He is highly insane and is a regular in Arkham Asylum. The Joker will at one time be mischievous and funny, but at other times be violent, brutal, and cruel. There seems to be no cure for the Joker’s insanity.
After all these years of mentally fencing with the Batman, dealing with a muscle-bound clod like Superman; The Diamond Squad is like taking a vacation!