Izuku Midoriya died leaving his mother and sister to mourn him. In most cases that would be it. However, Izuku is a special soul and the devil can see that. They strike a deal and Izuku is brought back as the spirit of vengeance. But these deals always have a price. Now, Izuku will deal with handling the consequences of his decisions while also sending criminals straight to hell.

All Might tell Midoriya he can't be a hero when he's quirkless. Does that stop the green bean? Nope. Finding an abandoned toddler in an alleyway wasn't on his to do list though. But no one cared enough to care if he adopted the kid or not. And if anyone thought something small like a villainous quirk was enough to put Midoriya off, then they were very, very wrong.

Neglected by his family and village, Naruto leaves for a year and comes back completely different. IMPORTANT :Started with the intention of a neglect fic but doesn't really fall under the category so much anymore but still worth a read.

Naruto, after an unexpected encounter with Madara Uchiha, is sent - via space/time jutsu - to another dimension: the DC Universe. Learning to accept his new life in a new world, Naruto becomes 'Fire Shadow,' the youngest member of the Justice League and Head Supervisor of the newly formed Young Justice Team.

Harry has been through a lot yet there are some perks to being as gifted as he is. So he's not going to just sit back and let the world shit on him. He's going to best the absolute best. First few chapters are hard to read. Get past those and I promise it gets better. Also, I know the beginning sounds very cliche. It's explained later so try to stick with it. M for bad stuff

After defeating Voldemort and freeing the wizarding world from his clutches, Harry was ostracized and labeled as the new Dark Lord. A belated help from Albus Dumbledore offered him a new chance at life, a new home to call his own, a new world to make a name for himself. Strong-Powerful-Shinobi Wizard Harry, Strong-Naruto, no pairings as of yet.

Unwillingly brought into a strange world, trying to hide your secrets, being there during a tournament that hasn't been held in over a century, and oh, having the most powerful wizard seeking you for your power. Simple? Certainly not.