I don't know if you're reading the manga or watching the anime, but the way shit's done in the Final War arc really throws a lot of it under the drain in my opinion. I get him accepting more power from AFO because he feels what he has isn't enough compared to someone like Dabi, but him getting reduced intelligence even worse than Gigantomachia as a result left a sour taste. I also get being manipulated into being the "face" of AFO's heteromorph forces with the ulterior reason to get Kurogiri, but I dislike that some random toady that Anima took out with a bunch of birds was the voice because Spinner could barely form a sentence.
I'm torn on this. I sorta get it, because AFO blatantly fed on Spinner's devotion to Shigaraki, and Spinner is devoted to Shigaraki entirely because he views him as a friend who never judged him. Yes, I didn't like the whole... Devolving Spinner into a mindless beast bit, but it made sense to me, because, again, AFO basically fed it to him as... "You're helping your friend this way." I'm sorta okay with it because it's painted as AFO basically taking advantage of Spinner, not something Spinner actually actively chose, himself. He was sorta tricked into it.
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Seplito Nash, Smelling Like the Vault since 1996 Step FOUR! Get Paid!