Updated 04-May-2020.
Mondo shtuff from around the internet, all about THE BATMAN WHO LAUGHS!
My botty best at summarizing from Wikipedia: the Batman Who Laughs is a fictional character in DC Comics . he is the evil counterpart and alternate version of Batman within the multiverse . his first appearance was in the crossover storyline Dark Nights: Metal Snyder explained his intent on the character in an interview by the Hollywood Reporter . “what he wants to do in Gotham is bring Bruce’s worst nightmares to life,” Snyder said . Snyder’s hope was that his the Earth-22 Joker learns of Batman’s identity as Bruce Wayne and kills other rogues . he then subjects thousands of Gotham City’s citizens to the chemicals that transformed him . Batman grapples the Batman Who Laughs appears to be the leader or second-in-command of Barbatos’ Dark Knights . he distributes joker cards to the Batman’s Rogues, giving them the ability to alter the Batman Who Laughs draws in alternate versions of Bruce Wayne to taunt his counterpart as he prepares for a mass assault on Batman . Batman is forced to ‘accept’ a twisted ‘transfusion a year later, the Batman Who Laughs is still locked up in the hall of justice . with the help of his new Secret Six he begins to set his plan in motion . he starts by having Commissioner Gordon lead Superman attacks The Batman Who Laughs, seemingly blowing his cover . however, the whole thing was revealed to be an illusion by Batman . the next step is having Scarab hack the Fortress of Solitude and Bat the Batman Who Laughs is one of the villains analyzed by Doctor Manhattan . he sees people’s dark urges and fears, visualized as alternate realities of their actions . his characteristic metal crown functions as Unlike Batman, he opts for lethal weapons that allow him to kill swiftly . like the inhabitants of the Dark Multiverse, The Batman Who Laughs has weakness to Nth Metal . the character has been the Batman Who Laughs is the primary antagonist in the Metal Part I episode . he returns in Metal Part II, attempts to bomb the Oblivion bar . McFarlane Toys has also made a