Dadbi AU anyone?
Izuku got adopted by his parents at a young age, when he was found by a young runaway teenage vigilante. The vigilante, Dabi, took the young kid in; refusing to let a kid go through a terrible childhood like he did. In order to support his new son, who he found had a letter on him naming him 'Izuku' (no last name), he starts working at a cafe. Well, he works at the cafe in the morning while he continues his vigilantism at night.
When his son was five, he was diagnosed quirkless. Dabi, although being very pissed at everyone around him, made sure to remind his son that even if he was quirkless, he wasn't unable to achieve his dreams.
About 1 and a half years later, Dabi got caught by a pro hero. The pro was Eraser head, knowing full well his son was gonna need to be picked up soon from school and worry about where he was; Dabi freaks out. Aizawa not knowing what to do, let him go seeing the panic in the vigilantes face.
The two, dad and son duo, used the last name of 'Hiro'. Dabi originally was just gonna train his son in self defense but it turned into teaching him all about vigilantism. Dabi often thinks about the fact that he could've ended up as a villain if not for his son.
When Izuku was a couple days away from turning 11, his dad meet a pro-hero in training. Hawks aka Keigo. Keigo upon meeting the sunshine ball that was Dabi's son, titled him self honorary dad.
Keigo and Dabi ended up getting closer and by the time Izuku was both turning 17 and Just named No.1 Vigilante, they had been married for a couple months.
Dabi started working at UA the following year, where he ran into Mr.Aizawa. He explained he had a son and what had happened all those years ago.
