Koichi has a simple personality and rather shy, he sees no problem in using his Quirk in public even though he is not a pro hero. That is what brings him to start doing good deeds for the public such, as returning dropped items, giving directions, helping people get onto trains, being a cameraman, and recycling. He has a very heroic nature and cannot ignore people that need help.

He tends to be a rather calm person, reacting to many situations in an appropriate manner. He is reasonable and is open to discussion with thugs and petty criminals, as seen with his interactions with the Three Storm and Stress Brothers. At the same time, he is quick to help when there is a real need for his abilities against Villains, showing that he can be attentive as well as calm.

He dreams of being able to become a recognized hero and is shown to enjoy the vigilante work that he does. He is willing to do the less glamorous jobs, such as cleaning up trash and does not seem to think that these are negative aspects of being a hero or vigilante. He refuses to give up doing it for the reason that it seems uncool because he claims that that's not the sort of person he is, showing that he does not seem to want to be a Hero for fame or money, but out of a genuine desire to help society and other people.