Arkham Asylum Okay, so the main villain is Joker. Cool! That'll draw in a bunch of noncommittal fans, plus it's the first Real Batman Game of this kind!

Arkham City okay....its Joker again...but he's sick this time. He might even die! He definitely won't be in villain shape for the next game. Besides, there's a ton of other villains in this! It's not that focused on him!

Arkham Origins this is the PAST it's before he existed there's NO WAY Joker is behind this. Killer Croc, Black Mask...all perfectly good, non-Joker related peopl-GODDAMMIT ITS HIM

Arkham Knight he's DEAD. he's DEAD we have to be free there's NOOOO WAY he could be behind this one!!! He's definitely 100%.....oh look there he is