Lately, just for fun, I’ve been analyzing what I think would’ve happened to various Batman characters had they been in the Fallout universe. Here are my conclusions.
Batman: Bruce Wayne married Selena Kyle (Catwoman) and had children. The mantle of Batman has been passed down from generation to generation ever since.
Robin: Each child in the Wayne family serves as Robin to gain training and experience until they are old enough to become Batman or Batgirl.
Alfred: Shortly before he died, Alfred obtained a Mr. Handy robot (also named Alfred) to serve as his replacement.
Commissioner Gordon: It is unknown whether Gordon died due to fallout or due to riots and raiders. Whatever the cause, it’s clear he died not long after the bombs dropped. His daughter Barbara suffered a similar fate.
The Joker: He became a surprisingly non-feral Glowing One and is still alive as of Fallout 4. He keeps a pack of feral ghouls as pets.
Harley Quinn: She became one of the Joker’s feral ghouls.
Mr. Freeze: He became a doctor for some settlers and lived out the rest of his years in this position. His special refrigerated Power Armor and custom Cryolator gun are on display inside the Batcave.
Bane: He became a Super Mutant after being exposed to FEV via contaminated Venom. He still has above-average intelligence by Super Mutant standards and has figured out a way to access a few of his pre-transformation memories, though not many and they tend to be somewhat vague. He now leads a group of other Super Mutants, all boosted by his Venom (as if they weren’t scary enough without it).
The Penguin: He managed to secure a position as an Overseer inside one of Vault-Tec’s infamous Vaults. He died due to the repercussions of the Vault’s experiments like most Overseers do.
Killer Croc: He was killed in an altercation with some Brotherhood of Steel soldiers.
Ra’s al Ghul: Ra’s al Ghul briefly became Ra’s al Ghoul. However, his immortality pool turned him back to normal before he could become feral. His daughter Talia, however, was not so lucky and had to be put down. His current whereabouts are unknown.
Clayface: He was at ground zero and died in the blast. He’s now a lifeless lump of terra cotta inside a crater.
Two-Face: He started up a gang of Raiders known simply as the Two-Face Gang. All of the raiders cover half their faces with tattoos and, like their founder, make many decisions by flipping bottle caps. Two-Face himself was killed by Mr. Freeze in a failed attack against the settlement he was residing in.
Poison Ivy: The radiation reacted with her powers, mutating her into a large plant.
The Riddler: He died due to radiation. Rather anticlimactic, really.
Mad Hatter: He was hunted down and killed by the Brotherhood of Steel due to his continued abuse of the Mesmetron.
These are the big ones. If you have other Batman characters in mind that you want to hear about, let me know and I'll tell you what I think happened to them.