After Tim went missing for three weeks, Batman discovered him at the abandoned Arkham Asylum, where it turned out The Joker tortured him for information and brainwashed him into being a mini-Joker.
when he was kidnapped by the Joker, Drake was implanted with a microchip that encoded the Joker's DNA with nanotechnology, into him. Over time, the Joker resurfaced and periodically assumed control of Drake's body.
Jason Todd was a street orphan until he met Batman after he had saved him from The Joker. Jason was trained by Batman and later became the second Robin, but he was beaten and tortured by the Joker, who sent Batman a video of the event and lied by telling him that Jason was dead.
That's easy, you kill Robin! “A Death in the Family,” which ran in Batman #426-429, hinges on a chilling scene where the Joker ambushes Robin (Jason Todd) and beats the Boy Wonder senseless with a crowbar, leaving him tied up in a warehouse with a bomb.
How did the Joker traumatize the Robins? In Batman issue 427, Joker beat the second Robin Jason Todd with a crowbar and blew him up with a bomb.
The Joker has played many cruel jokes in his time, but none were as cruel as when he manipulated the events of Jason Todd's entire life so that the boy would become a new Robin he could kill.
The Joker Does Not Care Who Is Behind The Mask
None of this matters to The Joker, however, as he's far more concerned with costumed personas than the ordinary people underneath them, so to him, killing Jason Todd was as much an attack on his and Batman's lighthearted era as killing Dick Grayson would be.
In the post-Crisis DC Universe, Jason Todd was tortured and killed by The Joker in the infamous “A Death in the Family” storyline, and while Todd has been resurrected since then, it remains one of the Dark Knight's most tragic moments (and one of The Joker's cruelest).
As Batman's nemesis, the Joker has been part of the superhero's defining stories, including the murder of Jason Todd—the second Robin and Batman's ward—and the paralysis of one of Batman's allies, Barbara Gordon.
Robin was the protégé of Batman and aided him in combating crime in Gotham City. However, at some point before the Battle of Metropolis, the young vigilante was captured and later killed by the Joker, with the aid of his girlfriend Harley Quinn.
Although his relationship with Bruce never truly healed, it did mend after a while with Bruce forgiving Jason for his actions and allowing to join Batman Incorporated as Wingman.
Though he never voiced it, Batman did privately admit that he didn't go searching for Jason because he was afraid of what he would find. He knew Jason was killing people, and Batman couldn't live with the shame of knowing that he had unintentionally created a deadlier version of Joe Chill.
In 1988, Jason Todd's Robin was Infamously Killed by the Joker. The most well-known death of a Robin occurred during the infamous storyline "A Death in the Family" by Jim Starlin and Jim Aparo. In this story, Jason Todd went looking for his birth mother, only to have her give him up to the Joker.
Tim looked out the window, to find a haywire helicopter with Owlman on top of it, which crashed into Tim's apartment building, apparently killing him. Tim survived this encounter and grew up to become a supervillain called Drake.
It's discovered that the Joker has a chemical curse that comes with his death. An airborne virus that infects whoever is nearest to him when he dies.
Yes, he's killed children before, most notably Jason Todd, the second Robin. The Joker doesn't care if his victims are male or female, child or adult.
Legacy. Since the film's release, many different interpretations of the character of the Joker have featured Jack Napier as his real name.
Damian Wayne killed Nightwing in the comic book Injustice: God Among Us, where Superman goes insane when Joker manipulates him to kill his pregnant wife, Lois Lane. This tragedy prompts Superman to “police” everyone and ensures no crime is ever committed.
Batman has trained many young heroes as Robin, and while they have all been impressive on their own, DC just confirmed that one stands above the others in terms of power: Damian Wayne is the most powerful Robin.
The death of Jason Todd nearly made the Dark Knight quit. The hero couldn't help but get the same feelings after nearly watching Tim Drake die in his arms and being forced to change his costume at his sidekick's request.
In the prequel to Injustice 2, Tim and the Titans (minus Superboy) are finally rescued by the remaining heroes. But just as he is reuniting with Batman, General Zod escapes the Phantom Zone and kills Tim by piercing Tim's heart with his heat vision.
Because he wasn't mad at the Joker— he was mad at Batman. He couldn't let go of the idea that Batman SHOULD kill the Joker. He keeps wondering how many people will die BECAUSE he won't kill him. It was really important to Jason that Bats step up and take out the joker.
edit: now i believe he was 15 or 16 years old, no more and no less, that's the age of the trigger for puberty and at that age he builds the muscle mass he had in the movie. Edit2: Did you guys realize how cruel the Joker is? He tortured an underage teenager to death!