Not only was she mentally ill herself,not only was she delusional to the point that her delusions harmed his mental state,but her disorders caused her to allow him to be abused by her boyfriend,and abuse him herself[physically and emotionally primarily and respectively].
Arthur was brought up by a foster mother and did not have a father figure. The foster mother herself describes him growing up as a fun and kind boy, but later he was abused and beaten by his adoptive parents and even had a severe head injury.
Penny is not mentally well as a person as she possibly has schizophrenic and narcissistic tendencies hinted in the film. She delusionally believes that Thomas Wayne will respond to her letters and help her and Arthur.
One of the most interesting subplots in Joker concerns Penny Fleck's claim that she once had an affair with Gotham City's resident billionaire business mogul Thomas Wayne while she was working for him, and that Arthur was Thomas' biological son.
At one point, Arthur does visit Arkham State Hospital and reads his mother's file, which says that she adopted him as a child and an abusive boyfriend took advantage of both her and Arthur when he was an infant/toddler.
The psychopathology Arthur exhibits is unclear, preventing diagnosis of psychotic disorder or schizophrenia; the unusual combination of symptoms suggests a complex mix of features of certain personality traits, namely psychopathy and narcissism (he meets DSM-5 criteria for narcissistic personality disorder).
Joker's blood behaves like a prion infection, attacking the brain and transforming these people... into him. Unless we find a way to reverse the process, no-one will be able to stop what he's unleashed.
Though the film is populated with comic book characters, no iteration of Batman has revealed Bruce is related to his ultimate archenemy. (He's famously an only child.) That's only the film's first radical twist to Batman mythos.
Stairwell with Mom's Records. This scene is probably the most emotional scene in all of Joker. Props to Joaquin because he puts on a fantastic performance. After Thomas Wayne tells him about his mother's stay in Arkham Asylum, Arthur tries to get the records.
The novel has been described as the greatest Joker story ever told. Batman: The Killing Joke (1988) built on the Joker's 1951 origin story, portraying him as a failed comedian who participates in a robbery as the Red Hood to support his pregnant wife.
She again called herself the Joker's Daughter and traded chattering teeth and riddles for more deadly accessories. She was shot to death by Batman IV, Tim Drake of the future. Before she was killed, she hinted that she knew more about him when he was younger.
Image via Warner Bros. Key to Arthur's spiral is new information he learns from his mother Penny (Frances Conroy), with whom he lives. Arthur finds a letter Penny has written to Thomas Wayne, claiming that Wayne is Arthur's real father.
His mother was an abusive and mentally ill woman who told him that his father was Thomas Wayne. When it is revealed that was a lie, he snaps and kills her.
According to the Arkham State Hospital's files, Arthur was adopted by Penny but her boyfriend severely abused Arthur, leaving him with traumas and physiological damage until he developed a neurological condition that caused him to develop uncontrollable laughter in unsuitable moments.
He experienced physical abuse and neglect by his stepfather. He was adopted by a woman who was living with her own mental illness, which prevented her from being the nurturing force he needed. These relationships could have made him feel safe and protected and buffered his trauma, but instead were limited and empty.
Lucy Quinzel is the daughter of the Joker and Harley Quinn and the niece of Delia Quinzel.
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.
On the surface, this Joker wants to look “happy.” That's what he's told he's supposed to be. And, his uncontrollable laughing condition is because of how he's been forced to control his anger and sadness; to “stuff it” deep down inside.
The Joker's Uncontrollable Laughing Is Actually a Real-Life Medical Condition. The script never names the Joker's disorder, but it's based on pseudobulbar affect. Warner Bros.
One of the mysteries in director Todd Phillips' Joker is whether Arthur Fleck really is the son of Thomas Wayne as his mother Penny Fleck claimed. Both Wayne himself and Arthur Pennyworth said it was untrue and that Penny was delusional, hence her eventual stay in Arkham Asylum.
In Batman's origin story, Joe Chill is the mugger who murders young Bruce Wayne's parents, Dr. Thomas Wayne and Martha Wayne. The murder traumatizes Bruce, inspiring his vow to avenge their deaths by fighting crime in Gotham City as the vigilante Batman.
Martha reveals that she forced Psycho-Pirate, a villain with extensive knowledge of the entire DC Universe, to tell her the name of the Joker in the main DC Universe. It is then revealed that the Joker's real name is “Jack Oswald White.”
His most recent physical transformation came when Harley Quinn shot him in the eye during the events of Batman #100.
Joker Jr. is the son of Harley Quinn and the mass-murdering criminal The Joker.
In the story, the Joker takes Harleen Quinzel to the chemical plant where he originated and pushes her into a vat of chemicals against her will, which bleaches her skin and drives her insane, resulting in her transformation to Harley Quinn, similar to the Joker's transformation in his origins.