To specify, I'm putting this up because I don't have the time to write a new fanfic myself. I can barely support the amount of Fanfic's I already have up.
Also, there are gonna be some weird ideas in here but if you want to do them please tell me. I would really like to read them.
Title: Green Mask
Summary: Izuku dies at a young age inside of his house. Inko is grieving when a young Toga who ran away from her home, breaks in and sucks some of Izuku's blood. Inko comes in and freaks out Toga causing her to use her quirk and transform into Izuku. Inko who has gone insane from the death of her child sees this and deludes herself into thinking that this is Izuku. After that, she takes in Toga and pretends that she's Izuku. Toga who has never experienced any parental love and affection before, continuous to pretend to be Izuku.
Extra: I know that in canon Toga's quirk has a time limit however I would suggest getting rid of it.
Title: Heroic horror
Summary: Basically turning Izuku into a creepypasta/horror movie monster. Izuku is murdered by some people because he's quirkless. After that, he comes back as a deformed monster like a version of himself(or a ghost if you want) and kills anyone who discriminates against people for whatever reason. Villainous quirks, weak quirks, quirkless, etc.
Extra: Maybe he gives his victims a chance to redeem themselves and if they don't, he kills them.
Title: Majin Izu
Summary: Exactly what it sounds like. Izuku gets turned into a Majin Buu like Nomu.
Extra: Rather than Izuku being a vigilante or Hero in this fic, I think a vigilante would be better. Maybe he was transformed as a kid and so he stays a kid forever, so he just starts doing hero stuff out the gate because of his new power. So Izuku would be a rampaging chaotic force of justice.
Title: A Hero's Dream
Summary: Izuku dies somehow and he becomes master of the dream realm. Basically meaning he can go into and control people's dreams. However, he can not hurt(Physically)people or keep them inside the dream if they realize it's a dream and try to wake up.
Title: Dark Mirror
Summary: Izuku has a quirk that can create duplicates of people. However, the duplicates he creates have only the negative qualities of the person, and Izuku can not control them directly.
Title: The reign of the Dekus.
Summary: Based on the death of Superman and the reign of the Supermen. Izuku dies and four heroes emerge to try and take the title. Izuku's successor, a Robotic duplicate, A Nomu clone of Izuku, and Izuku's kid. There can only be one Deku, who will become the next Deku in the eyes of the public and Izuku's friends.
Extra: While this is based on the Reign of the Supermen, I would suggest not copying the story completely. And I would not recommend having one of the Deku wanna bes become a traitor, and If you do I would suggest against making it the robot.
Title: The Will to Continue.
Summary: Izuku has powers that are similar to the Apathy from RWBY. Whenever Izuku touches someone, he drains their will from them, until either they lose the will to even move, or until Izuku stops touching them. The effect is temporary though, however, it will probably leave a huge metal scar on its victims.
Title: Mimic
Summary: Izuku has a quirk that allows him to turn into other people. However, Izuku has to always be someone else, once he got his quirk as a kid he was never able to turn back, even Eraserheads quirk won't work on him. Izuku will turn into whoever he is thinking about at the moment, but his clothes will not change with him.
Extra: I would suggest having Izuku be unable to copy All Might's buff form, otherwise the story could get boring. Maybe say that Izuku can't copy One for All.
Title: Equivalent Exchange.
Summary: Izuku can swap any two things so long as they are around the same weight and he can see them. Very tricky.
Title: Rewind and Fastforward.
Summary: Izuku and Eri are twins who were both given to Overhaul. Izuku has the opposite quirk of Eri, Fastforward and unlike Eri, he can use it on himself. Izuku is as old as Eri however he uses his quirk to make him older so he can escape Overhaul with her.
Title: Flawed
Summary: Based on an Inhuman. Izuku can see the flaw in anything if he looks at it for about thirty seconds. This does not apply to anything that he hears so he would have to visualize that in his mind for thirty seconds if he wants his quirk to work on that.