[P5 spoilers] Other AUs that would be interesting:

Haru and Akechi both Black Mask-ing it up.

That would. Get codependent quickly and end in two dead fathers, but it would be interesting.

Huh. I've heard of AUs of Ryuji being an accomplice to Akechi (or that one with Ann going Black Mask after murdering Shadow Kamoshida) but not with Haru.

That would be interesting.

I can easily see her father throwing her to the wolves.

Well yeah it's practically canon.

I'm not sure this is one I can write myself, but.

(Would not be surprised if this AU resulted in two dead fathers by untraceable means before the snap election even really revved up. The conspiracy hydra would grow a new head, but they'd both feel better.)

at last