After being revived by Ra's al Ghul with a Lazarus Pit, he took up the Red Hood alias and became a murderous vigilante at odds with the Bat Family and their allies, before later redeeming himself and becoming an ally of Batman again.
Jason Todd, also known as Red Hood and formerly Robin, is a major antagonist in the TV series Titans. He is a supporting protagonist in Seasons 1 and 2 of the series before becoming the secondary antagonist in Season 3.
Red Hood's motivations revolved around destruction and nihilism which he believed were the only truths of the world, especially Gotham. He became a recurring enemy of the vigilante who would come to become Batman who proved himself to be a persisting thorn in his side.
Batman: White Knight Revealed Red Hood Hates Batman For Leaving Him.
The Red Hood
Though typically seen as a villain by this point, Jason Todd is still technically battling against criminals and fighting to stop meances like the Joker, and though far more ruthless and brutal then most DC heroes he still has scruples and a code, and has no desire to hurt innocent civilians.
After capturing Scarecrow and returning to Panessa Studios, the main floor between the cells was painted with a large, red logo of Red Hood. It was Jason's way of showing Batman that he was back and that he had forgiven him.
The Joker (real name unknown) is a homicidal maniac with a clown-like appearance, bent on creating havoc in Gotham City and fighting a never-ending battle against Batman.
Believing Batman's methods for delivering justice were too soft and ineffective, Jason decided to take up the mantle of the Red Hood so he could punish evildoers with his own brutal sense of justice. The Red Hood was originally a disguise worn by the Joker before he was transformed into a laughing maniac.
After some investigation, it's revealed that the Red Hood was actually the Joker. The criminal explains his origin himself: “I was a lab worker, until I decided to steal $1,000,000 and retire! So I became The Red Hood!
After becoming disillusioned with the Titans and Batman, Jason Todd was killed at the hands of the Joker. After his murder, Jason Todd was later resurrected by Jonathan Crane.
Jason Todd, the former Robin killed by the Joker in Batman: A Death in the Family, is revealed to have been resurrected by Ra's al Ghul via the Lazarus Pit. But the pit changes him and his emotions and he becomes the new Red Hood.
All of Batman's comics point out one brutal arc, which is Jason's death, but many of you don't know the whole story of why did Joker kill Jason Todd and all the terrible things he's done to him. Here we dive deep into the scenario where Jason Todd was captured and tortured to death by the Clown Prince of Crime.
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.
Jason's heroic Red Hood costume. Jason survived his fall and gave up his claim to Batman's mantle.
Jason despised Batman for not avenging his death and replacing him with Tim Drake, so he takes his fury out on the new Robin, savagely beating his successor. Jason's jealousy gets the better of him when he assaults Tim in Teen Titans Vol 3 #29.
The panel reveals the Joker knows the secret identities of Nightwing (Richard Grayson), Drake (Timothy Drake), Robin (Damian Wayne), and the Red Hood (Jason Todd).
TLDR: Superman didn't save Jason because he was being tortured by Lex Luthor at the time in order for Luthor to create Conner Kent/Superboy. This is why he wants nothing to do with Superboy once he appears.
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.
The ultimate Batman villain is a deranged psychopath who acts as more of an agent of chaos than an organised criminal. Also known as the Clown Prince of Crime, the Joker is the arch-enemy of the Dark Knight — one capable of such unthinkable evil that can make even Batman shudder.
To Be Forgotten. While fans got to hear many memorable quotes from Joker in Batman: Arkham, the series also revealed what his greatest fear is supposed to be. As it turned out, The Joker feared being forgotten more than anything else because it meant nobody was afraid of him anymore, rendering all his crimes void.
Arguably the Joker's greatest weakness is his ego, however. He turns to crime to get the attention he desperately craves from Batman.
Richard Grayson is clearly Batman's favorite son : r/Nightwing.
Dick's immediate reaction to Jason's death was like this: Shock, disbelief and anger for why he was not told. He was at Tamaran at the time Jason died, but that does not excuse Bruce, Alfred or anyone else not telling him immediately after knowing about his return.
A Death in the Bat-Family
“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.