^Nice fanfic, bro.
Personally, I'm considering something that was said back on the first page about there being other super-powerful organisms like Koro-sensei, but the twist would be that they would ALSO be forced to participate in school (either as students or staff). Either that, or the mission to kill Koro-sensei is meant to help train the class E students to fight against said organisms. But who knows? Maybo Koro is the only one of his kind after all!
Anyways, it was awesome to see the teacher wise up to Karma's antics. That web of tentacles was great too, IMO. But as cool as Karma is and all, I still want to see if the rest of the class can come up with some clever assassination tactics....