Koichi Haimawari/Synopsis

History
When he was a baby, he was able to float before he could even walk. As he would tend to float out of his crib, and even towards roads into traffic, his worried mother would use her Fly-Swatter Quirk on him whenever he floated, possibly conditioning him into not using it and causing him to forget that he even had the ability.

Later on in life, Koichi started impersonating All Might while interfering in fights, putting himself in danger to help people. Koichi was determined to be a hero, but the morning of the high school entrance exam, he stopped to save a drowning child. He gave the child his silver age All Might hoodie to keep warm, and then rushed off to the exam, for which he was too late.

Having lost his chance to become a hero, Koichi decides to study Hero Sociology at the college. When he moved to Naruhata, he rented out a old penthouse on top of an old building for a cheap price. At the time, Koichi thought it was a good penthouse to live in as it would easily kick start his campus life. One night, he wanted to invite some friends to his home, but due to a misunderstanding, he was seen as a perverted and dangerous student, making many of his colleagues to avoid him. As a result, Koichi's campus life debut was a failure.

To earn money for rent, start working as a clerk at a convenience store. It is also when he begins to "work" as a vigilante, doing good deeds for the public, which makes him being appreciate by the citizens, who start to refer to him as "Nice Guy".

Synopsis
One day, while on his way to his workplace, Koichi stumbles into a group of thugs and knocks into Soga Kugizaki, which spills the juice he just bought. The thug orders Koichi to apologize by getting down and groveling, to which Koichi obeys, but Soga wants to humiliate him, so he escapes, being chased by Soga and his friend Moyuru and Raputo, until they lose his track.

Later, Koichi sees another group praising a freelance idol, Pop☆Step. A police vehicle is passing by, so Koichi warns Pop☆Step. As she ends her live performance, Koichi slides to his place of work. Customers arrive, however, they are Soga and his buddies. Soga takes Koichi outside and beats him up, threatens him with spikes. After being forced to buy juice for Soga, Koichi is annoyed at being beaten up and changes into his "suit", an All Might-styled jacket and a mouth mask. Koichi decides to deliver justice on his own accord, which basically is doing public services such as returning dropped items, giving directions, recycling, etc... The citizens thank Koichi who feels overjoyed in helping people.

With his good deeds done for the day, Koichi begins walking home. He meets Kazuho again in an alley. She thanks him for warning her about the Police and followed him in order to properly thank him, but she make fun of him for being weak and wearing an All Might hoodie, which causes both to start arguing. Pop☆Step begins to leave but bumps into Soga and his friends. The thugs recognize her as the online idol, begin mocking her and even thinking to sexually assault her.

Scared, at first Koichi thinks about leaving her to her fate, but seeing her scared face decides to help her without thinking. He does not have much success at first, and all he gets is to anger Soga even more. Soga decides to finish off Koichi with his Quirk for annoying him.

Suddenly, Knuckleduster appears, crashing down onto a trash heap. He defeats the thugs and checks their tongues to see if they’re discolored, but cannot find anything. Then, Knuckleduster turns his attention to Koichi and praises him for his efforts. Suddenly, Soga takes Pop☆Step hostage, threatening to claw her face off, but Koichi charges at the thug and knocks him down, allowing Pop☆Step to escape and Knuckleduster to punch Soga into the wall, which knocks him out. Impressed by Koichi's bravery, Knuckleduster decides to take him as his disciple to make him a hero, despite not having the license. However, Koichi finds Knuckleduster to be dangerous and turns down his offer.

Koichi then returns to his apartment, only to find Knuckleduster there. Knuckleduster then informs him about Trigger. He attempts to prevent Knuckleduster from going too far while looking for Trigger users and meets Pop☆Step. They later encounter what appears to be an ordinary businessman being harassed by Knuckleduster.