A series of attacks on criminals throughout Tokyo by a mysterious vigilante draws three of the strongest heroes in all of Japan together in an effort to stop the attacks. However, once they manage to capture the vigilante, they are draw into a strange and dangerous new underworld of crime and mysticism, filled with knowledge and intrigue that could bring Japan to its knees...

Sorry this description sucks After returning to UA after the fight with Stain, Izuku is told by All-Might to return OFA. After leaving in a fit of rage, he is captured by the Foot Clan and turned into a mutant crocodile girl. He is then saved by the turtles and their master, Splinter, and decides to join them because why not.

Izuku was having a nice day like any other kids except this time he went into the sewer with his friend to find something spooky only to end up being crashed with four mutant turtles with mad ninja skills, and Izuku suddenly became a mutant rabbit boy with super powers. Now join Izuku and the ninja turtles go on crazy adventures both within and below New York City. Harem. Lemon.

"It's not a mutation. It's called a Quirk. Instead of being ninjas or whatever, become heroes." The Gang thought this whole time it was a mutation, to find out it wasn't. Each of them had a Quirk. And with this Quirk could be more than just hiding in the shadows. They could become heroes.

Donatello's experiments with dimensional travel leave the 5 siblings stranded in another world. how will they fare in a world geared toward Heroes and Villains while Donnie rebuilds the portal, and trouble lurks behind a thin veil? (cross-posted on ao3)

In this alternate universe, Izuku was chosen to be All Might's successor and during his fifth month of his ten-month training, Izuku was returning home from the market, until he noticed suspicious people doing something strange. But before Izuku could call the police or a hero, he saw 4 figures coming out of the shadows and they fought these people and when our protagonist follow..

There is Evil in Good and Good in Evil, after a scandal involving a married woman Japan's #1 Hero has come under fire. Using his 'wet work' underling and Japan's #2 Hero, All Might wants this blemish to be 'cleaned and at was 15 years ago and now his sins have come to roost. Also Yaoi/confused Bakagou.