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ok so demon dazai is great but have you considered. Demon reader? Just imagine demon!reader who has some clingy human who they havent figured out how to get rid of
as a matter of fact i love the idea of a demon reader. esp with dazai. can u imagine mr osamu dazai summoning a demon and decides you need to stick around. so let's say you need to fulfil the wish of your summoner to go back to hell because you're bound to him or something along those lines. at first he tells you he just did it for fun and didn't actually expect you to show up and then as you spend more time w him and he starts liking you, he decides he just will not make a wish so you stay around longer!!!
dazai is perfect for this because he'll be fascinated by a demon reader. and he works perfectly as the super clingy human who doesn't care that you could quite literally pulverize him. asks u to pick him up and carry him and pokes and prods at you nonstop.