FanFiction Prompts/Challenges/Ideas

Assassination Classroom

I have several different ideas for this.
- Somehow Karma and Nagisa, maybe some others, time travel to when Koro sensei was human and still the reaper. This could be before or after they find out his past. I think it would be interesting to see korosensei's past self react to them and how he'd manipulate and use them. I can see this being a one shot where they travel back in the end or a long series where Korosensei decides to take them on as apprentices and have it be a lot darker then the show and manga are.
- In a reverse situation somehow the past Korosensei is transported to the future and learns about what happens to him and about class 3-E. I could see this being a watch the show and have two parts of a series situation or he spies on them and learns the bare minimum. Again this would be another really dark story with dark class 3-E.
- Another watching the show fic. The whole school with students and teachers, the assassins they have met like Lovro and his students and as many other people as possible.
- Somehow a Korosensei that didn't get tentacles and become a supernatural being takes over class 3-E without being watched by the government. Again this one is really dark.
- Class 3-E has a hive mind. I'm not sure about this details or specifics but I want them to have a hive mind and to be really badass and dark but also kind of wholesome. Like they help Isogai out a lot with his money situation and things like that.
- This ones kind of similar to the other one but since they're assassins and trying to kill korosensei then they would be actual assassins and it's just a dark class 3-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.
I've kind of been shocked at how little fanfiction there seems to be about a dark 3-E. I rewatched the show and now that idea has been stuck with me.