Me: Okay, I know I say I'll ship Fyodor with anyone, but I'm gonna stick to mainstream ships like Fyolai and Fyozai because there's more content.
The fascinating dynamic he has with Chuuya because Chuuya is the vessel for a non-Christian god:
The way he seems to admire Sigma for being so far from humanity, and understand his feelings of isolation and loneliness, but still manipulates him seemingly without care:
The fact that he and Bram could have been one of the few reoccurring elements in each others' lives:
Him being uncomfortable and enraged by Atsushi's show of vulnerability:
Ranpo being similarly smart to him, but in a different way and therefore offering a different challenge to Dazai:
He and Agatha both being super elegant and feminine looking and giving villain couple vibes:
Yosano's ability and his being parallels (she can heal others by fatally hurting them, he can heal himself and kill others by making them fatally hurt him):
Oda and Fyodor both being heavily influential forces in Dazai's lives, and the fact that Oda is knowledgeable about the bible:
Jouno having white hair and being willing to kill Fyodor, not to mention that Jouno is a redeemed villain:
Kyouka and him having similar vibes, and the potential for her to be recruited by the DoA in an AU where they get to her before the PM or after the PM but before the ADA:
Seriously I'm pretty sure you can take two completely unrelated characters and find at least one similarity or difference that could make them an interesting ship and I love that!!