The Joker

While it could be argued that this version of the Clown Prince of Crime more resembled the colorful, comic relief character featured in the comics of the 1950s and '60s and the 1960s show, he was still a highly dangerous, intelligent, and cruel character - as most of his crimes were silly and prank-like in nature, they could still be legitimately destructive. Joker treated each of his crimes like an elaborate joke designed to make his victims literally die of laughter. Due to his unpredictable nature, bizarre appearance and unnerving instinct for the absurd, Joker earned a reputation as one of the most dangerous criminals in Gotham. Despite his rivalry with Batman, he was shown respect for his abilities and even saved him from Wrath and Scorn so they could keep fighting. He also seemed to care about Harley Quinn, as he admired her show and even once saved her from Batgirl in issue 35 of The Batman Strikes.

Sometimes he would simply intend to cause relatively harmless mischief, such as messing up statues with his Joker putty, pranking people with Donnie or throwing coins into a water fountain with Harley. Other times, he will get more dangerous to the point where in Joker Express, he fills dynamite in Gotham and attempts to blow them up to make Gotham fall into a sinkhole and when he steals Bane's Venom to wreak Gotham.