After Gonta kidnapped both , the Ultimate Artist, and , the Ultimate Magician, Kokichi left in order to get everyone else's motive videos. Fitting his appearance, Kokichi often acts notably child-like, with at least some of it appearing genuine while part of it also could be just his attempt to use his looks to his advantage. Apparently, his pants are made to look like a piece of punk fashion with bondage pelts, but they are actually just fake belts sewed to thicker part of the thighs. During the fourth trial, he is highly amused when Shuichi talks back to Kaito even though he is supposed to be his sidekick and he thinks it's really funny when Kaito looses his cool. Kokichi never realized Gonta's memory loss during the investigation, just viewing him as being as dumb as always. Kokichi declared that everyone was free to do whatever they pleased before leaving them all in a state of despair and taking Kaito hostage in the Exisal hangar, confident that he had broken everyone's spirits with his lies so much that they wouldn't want to do the Killing Game anymore.
Because of this, making him a trickster who stirs up the trials was considered indispensable. The Second Investigation and Class Trial The very next day, Kokichi was one of the few who did not attend Himiko's magic show, where the next victim, Ryoma, would be found dead. He believes that Kaito's attitude with a group of other people could cause a new killing game. After Kokichi returned with everyone's motive videos, Gonta told him about the people he was unable to detain while everyone else was even more irritated that Kokichi took so long to return while they had been swarmed by insects.
In general, lots of his so-called supreme leader behavior seem more childish and harmless than anything else. During his Free Time Event with Shuichi, Kokichi claims he became the supreme leader by killing his parents and taking their place. Kaito once again became outraged with Kokichi and attempted to punch him yet again. Instead of tending to his wound, he decides to pull a prank by faking his own death, lying face down in the middle of the fourth-floor hallway. Kokichi once again pretends to not know anything and go along with everyone else. Despite Ryoma suggesting that they exchange them, wanting to see who could be the most important person in his life, everyone rejected the idea, afraid that it would cause another murder to happen, much to his annoyance.
He suddenly claims he was just kidding and suddenly runs off, which confuses Shuichi even more and he shouts after Kokichi. In Chapter 2, he mentions that everyone's got it all wrong and he claims that he only acts like a bad guy so that the others wouldn't get too soft. As a result, two days after the motive videos were distributed, Gonta began to kidnap various students into his lab, completely unaware of the Ultimate Supreme Leader's true intentions. This drew the ire of Kaito, who finally had enough of Kokichi's antics and punched him in the face.
Kaito admits he hated Kokichi and that he pissed him off, but also admits that only a crazy guy like him could have a crazy plan needed to defeat Monokuma, and the two appeared to form a sort of mutual respect during their last moments. This intrigued Shuichi, but he had no chance to investigate himself as the announcement telling everyone to go to the trial room played. Kokichi laughed Maki's claim off, claiming she was lying out of desperation. However, on the other hand, he has also claimed that he is a pacifist who likes to settle fights with games and that he uses his authority to control mafias so that they wouldn't fight each other and cause trouble for everyone.
During an event in the bonus mode, Kokichi claims that he truly respects police officers, who fight the bad guys yet get blamed by the public. He has claimed that, among other things, his organization has covert agents in every country, control over all the mafias in the world, torture as a form of punishment, and that his defeated opponents will get sent in Siberia. The Ultimate Supreme Leader asked him if it was really okay for him to believe a liar like himself and said that he should check the Flashback Light for himself if he really wanted to save everyone. On the night of the time limit, Kokichi remained alone in his room. The remaining participants demanded that Kokichi explain the secret of the outside world if Gonta actually meant anything to him, but he refused. Kokichi later regathered with everyone else in the dining hall to investigate yet another Flashback Light.
To further his own ends, Kokichi kept this truth hidden but continued plotting. Himiko acknowledged his statement but said that that was the reason she was so upset now. The owners themselves have an extensive background in motorcycling, both as riders and industry experts, including many years of working for Harley-Davidson Motor Company. Maki became increasingly worried upon seeing this and threatened to kill Kokichi herself. On top of this, he correctly predicted the exact way Kaito would die and even foreshadows Tenko Chabashira's death minutes before it happened. The Monokuma Kubs and Angie both claimed that it's because Angie can only work in private and as such, needs a key for her lab.
The morning of the next day, Kokichi along with everyone else would gather in the dining hall once again and have a normal, but forced the conversation to try and make themselves not think about the horrible events that transpired yesterday. Kokichi was rendered mute by this act, and everyone ate breakfast in awkward silence. He tends to complain about situations he finds boring and even during some bad situations he states that at least they're not boring. Afterward, seeing that Himiko was still trying to hold in her emotions from Angie and Tenko's demise, Kokichi called her out, belittling her for still holding back. His entire body, nothing but raw and unfettered malice. Afterward, the Monokuma Kubs showed up and handed out four random items that the students could use to unlock more areas in the academy.