WMG: The Joker

Joker Immunity is actually Spring Time For Hitler meets Suicide by Cop, with a touch of Ironic Hell for good measure
The Joker's depressed about something, so he's decided to commit very vile crimes in hopes of getting shot by a police officer. The powers that be decided, however, that the best way to punish the Joker was to force him to fight a technical pacifist for eternity.

The Joker is Nyarlathotep
  • Alternatively, the Joker's Multiple-Choice Past and insanity were caused by Nyarlathotep to create some one to torment Batman

Think about it:
  • "I've spent my life behind these steel bars"/"These prison walls secure me" = Arkham Asylum's revolving door policy means that the Joker has somewhere he can rest and plan his next crime spree.
  • "Ask one who's known me if I'm really so bad" = I think we all know the answer to that.
  • "They tried to reform me, but I'm made of cold stone" = considering the Joker, it makes perfect sense.
  • "I stand accused before you, I have no tears to cry/and you will never break me 'til the day I DIE" = again, it just FITS.
  • "I'm numb to pain" = Now what does THAT remind anyone of, hmm?
  • "I have no guilt to haunt me, I feel no wrong intent"
  • I defy you to watch the video and tell me that Gowan was NOT inspired by the Joker.
  • And now we have this little gem. Coincidence?

Joker's actions toward Harley in Death of the Family were his attempt at getting back at her
Think about it: he's dead for like 5 minutes and she f*cks Deadshot. Even a sociopath like Joker would be hurt. He felt like she replaced him. So he tries to give her a taste of her own medicine. But his twisted mind means he takes that Up to Eleven: telling her he never loved her and throwing her in with a bunch of dead bodies that he claimed were past Harley Quinns (he lied) to make her feel just as replaceable as he felt.

Really, the whole arc can be summed up as Joker seeing how well everyone had adjusted to life without him, and feeling a little offended by it.

Joker is the Bat Spirit of Arkham Asylum.
Apparently all of Jokers origins center around Batman and considering how Joker is clearly feigning insanity to avoid the Death Penalty and that he commits crimes out of a desire for fame and notoriety it's likely that he was the one who terrorized Amadeus Arkham and his mother into insanity. When Batman showed up and was treated as the supernatural Bat Spirit the Bat "Spirit" became furious and sought to become an enemy of Batman to reclaim notoriety and fame thus becoming Red Hood. After falling into chemicals and becoming the Joker the Bat "Spirit" saw a way to reclaim notoriety and fame while tying the legend he started to Batman who would in turn be tied to him.
  • Worse he's Darkseid's ultimate weapon the Hyper Adapter after being scattered throughout time following it's purge from Batman which as the comic has shown taken a batlike form upon being scattered through time...

Joker knows Green Arrow and Black Canary's secret identities
In issue #4 of his short-lives comic in the '70s, Joker sent out a fake distress signal which lured Ollie away. But how would Joker have known that would work unless he knew he was Green Arrow? And then, he traps Dinah Lance in what he himself calls a fishnet. Nobody knows Hoist by His Own Petard like a comedian, if even a homicidal one.

In relation to the "Joker is the Bat Spirit of Arkham Asylum" WMG Joker became the Joker deliberately.
The story of Jack Napier checks out except for one thing: There was a third leader of the group who Napier was betrayed to... What's more Joker showed fear over Batman knowing his true identity despite telling Batman the Jack Napier story. Therefore Joker wasen't Napier but the third leader of the group or should we say the real leader of the group... It's so convienient that the Bat of Arkham/Red Hood fell into a pool that turned him into a clown(basically the opposite of a bat). The Bat of Arkham experimented on chemicals until he got the formula to create permanent clowns(so that he couldn't be unmasked) than used the most usable factory chemical worker(namely Jack Napier) to create a vat of chemicals that would turn him into an clown. When the guy's job was done the Bat of Arkham would arrange for him to "have that one bad day" than kill him and dispose of the body when it was over in order to give himself a easily verifiable backstory and then don the Red Hood and lead his men into the factory where Batman would almost certainly show up and beat him leading to the Bat of Arkham Asylum falling into the vat and becoming the Joker.

Joker plans to have Batman kill him in order to restore the Bat of Arkham Asylum's reputation
As shown in the comics the Joker survived a bullet to the head so if Batman deals a fatal blow to the Joker it wouldn't be fatal yet would give Joker a means to fake his death then reappear in Wayne Manor in the form of the Bat of Arkham Asylum to kill Bruce Wayne. The reason the Bat of Arkham Asylum dosen't do that earlier is to publicly prove to Gotham that Batman is the Bat of Arkham Asylum and not an imposter cribbing off his style. If Batman kills someone the world will think he was the Bat of Arkham Asylum all along and just faking goodness. If Batman dies as an old man then Joker will be forced to face the publicity of having the Bat of Arkham Asylum's reputation ruined. What kind of reaction he would have from this is unknown.

Joker is Trigon the Terrible's father and thus Raven's grandfather.
Trigon is called the halfbreed son of one of a mystic cult's gods and a female of said cult yet they don't mention that god's name.... At one point in time Joker became Emperor Joker with Myxlplyx's powers which believe it or not include Time Travel which could easily help Emperor Joker become Trigon's divine father and be the source of Trigon's demonic nature.
  • Harley Quinn(one of them at least) is most likely the female member of the cult and Trigon's mother.

All the Joker's pasts are canon.
But with a twist: they're canon to different universes. Like Batman in Whatever Happened to the Caped Crusader?, whenever the Joker dies(and I mean dies for real), he reincarnates as a counterpart of his from another universe. When the Joker got his famous acid bath, something happened. Somehow, the Joker caught a glimpse of these incarnations before he died. As such, he remembers the origin of every Joker, but can't figure out which is his specifically.

The Joker's past...is completely ordinary and mundane.
And that's precisely what motivates him to do all the crazy stuff he does. Before becoming the Joker or even the Red Hood, the Joker was just some ordinary guy doing run-of-the-mill work. However he came to hate his mundane life, wanting something more exciting for his life, all the meanwhile suffering from depression due to the monotomy. But he never got the chance. Eventually, the Joker snapped and decided to join the Red Hood gang, wanting to get rid of the boredom. And then he fell into a vat of chemicals. With a completely new identity, the Joker was set free from the shackles of his boring life and able to do anything he wanted.

The Joker despises his old life, and everything he does is, on the most fundamental level, to escape it. The Multiple-Choice Past is an attempt to distance himself from his actual origin as much as possible, so nothing can hold him back. The reinvention of himself is to prevent his new life from becoming normal and repetitive. Every act of chaos, every moment of insanity, literally everything we know the Joker is exists as the ultimate rebellion to the past he hates and fears more than anything. There's a reason he refuses to even have his name known: because the only life worth living to him is the Joker.

The Joker actually has a superpower aside from Joker Immunity: Supernatural timing.
No one could pull off half the random crap Joker does unassisted. All the near deaths, convoluted plots and inevitable escape attempts... impossible without some other force at work. But really, it's his name that gives it away. He's got a power any comedian, class clown or joker would kill for. He has a supernaturally good sense of timing. That's why all his schemes can work and why the only times he gets caught are when he can safely get away later. Because even if he's unaware that he's doing it, he's always in the right place at the right time. Joker probably isn't aware he even has this power, but it's part of the reason he never gets over his insanity. Because everything always works out for him, he's never confronted with facing reality aside from the chaos he creates. Except... for... the Batman. Maybe he's immune or maybe he's just so organized he can cut through the chaos, but for whatever reason Batman's the only one who can overcome this subtle power. Joker may be aware of this subconsciously or just pick up that things go wrong whenever Batman's around, but he knows he NEEDS to kill him.