Check out this sweet AU @appleyjuiceboy and I came up with where Adachi after the accomplice end (not That One, the one where Yu never confronts Adachi about the letter), eventually gets bored and tries to destroy all of reality instead of just Inaba.
He eventually finds out about Maruki and meets him, and Adachi tries to manipulate him into being evil but Maruki is manipulating him into being nicer and a friend instead. Heβs also the Devil Arcana for Joker.
But they are cool antags that share a palace!!! Their aesthetics clash so much and they argue about whether to fix or destroy the shitty reality!
In the end, they make Joker choose. If he decides not to make a decision, they go 50/50 and make both Eden and purgatory, and sinners like Shido are banned to the Magatsu zone.
tldr... the phantom thieves fuck around and find out, their boss fight is hell, and adachi is a surprisingly okay friend even when drunk on power.
