Idea:
Highschool dxd x fnaf (kinda)
Basically Issei after his 'death' to Raynare would awaken a soul fragment of William Afton, ( i really like stories with soul fragments huh?)
Now i'm thinking more of William Afton from the books rather than the games, so let me explain.
He would be kind of cold and mainly would be a 'crazy scientist' William in the books did a lot of human experiments AND his experiments with remnant after his killings,
Also instead of Boosted gear he would have a sacred gear called Annihilation maker,
Which is a real sacred gear from dxd, allowing the holder to create alive beings with their powers only limited to the holder's imagination.
I don't actually know what its balance breaker form is, so if i don't find canon one, i'll just make something up.
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This will probably be deleted once the story comes out
Coming 2023