So I have two ideas for this that can go together or separate. First is that they're a hive mind. I'm not really sure how it would happen but it seems like a cool idea. The other is that since they're assassins and trying to kill korosensei then they would be actual assassins and it's just a dark class E. I don't know if that would include the teachers or just them or however. And it could go similarly to the anime/manga where they succeed in killing Korosensei or they could save him. Or Korosensei could have just been his normal human self and taken over which would explain how E class would end up being dark and evil in the first place.
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FanFiction Prompts/Challenges/Ideas
RandomIdeas for fanfiction with some crossovers that have been on my mind and it will drive me crazy if I don't write down anything about it.