Supposedly Real Past
Kokichi Oma was a normal talentless high school boy who participated in the 53rd Season of Danganronpa, a famous worldwide reality show made by Team Danganronpa.
During his high school days, Kokichi attended Imperial Capital's Imperial High School (帝都大帝都高校). However, it is unclear if this memory of him was a part of the fabrication made by Team Danganronpa or if it was genuine.
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Fabricated Past
After he successfully participated in the 53rd Killing Game, Kokichi's memories and past were fabricated by Team Danganronpa as follows:
Kokichi's past is very unclear due to his constant lying and the fact that he strictly refuses to reveal anything personal about himself. In fact, the only thing known about his life for sure is his love of video games and that he's been playing them his whole life. However, he has also claimed that nobody would care if he was gone, and it's been implied that he has no parents or family.
It's known that he is the leader of D.I.C.E., a small group of young pranksters, who are the most important people and like a family to him. They have traveled around the world and commit "laughable crimes" for fun, which could indicate that they could be a group of orphans with no families nor parents to hold them back. Kokichi is also good at stealing, which might be due to his past, and it has been pointed out that many of his skills have a resemblance to a petty thief. Furthermore, his organization could be a reference to the animated television series D.I.C.E. (DNA Integrated Cybernetic Enterprises), which is about an organization run by children, specifically orphans.
During the killing game, Kokichi lies that he is the supreme leader of a large, evil secret society. Obviously, there is no evidence of it and the Ultimate Detective, Shuichi Saihara, does not know any organization matching with the one Kokichi mentioned.[4] During his Free Time Event with Shuichi, Kokichi claims he became the supreme leader by murdering his parents and usurping their role. He then claims he lied, and that the one he killed was his older brother. He claims he lied again and that the real reason is a secret. Considering his tendency to have some truth among his lies, this could imply something about his past.
There is a scene in the bonus mode Ultimate Talent Development Plan which hints about his family situation, as Kokichi and Kaito won't go home for New Year's, Kaito due to his unconventional family situation of living with his grandparents. Kaito asks Kokichi why he isn't at home with his parents (and aren't his parents embarrassed of him being such a brat at his age). Kokichi only tells him that he shouldn't ask such personal questions when talking to the supreme leader.
However, it is unclear how much, if any of Kokichi's past before participating in the 53rd Killing Game was real, and which was fabricated by Team Danganronpa.
