PERSONALITY
(TAKEN AND TRIMED FROM THE WIKI(and excluding anything about the killing game))
He is an elusive and manipulative person who unabashedly tells lies and says whatever he's thinking. He is also strangely straightforward about his supposed evil nature, openly claiming to be a leader of a large secret society, admitting to being a liar, and saying he has done nothing but bad things.
Kokichi is a trickster character in the truest sense of the word. He is very mischievous, and he enjoys pranks and teasing others, sometimes in quite mean-spirited ways. He appeared to have a strong need for attention, as he got irritated if people talked over him or didn't react to his antics the way he wanted them to. He also appeared quite arrogant. Because of his behavior, he is viewed as an antagonistic figure among the group, but this doesn't seem to stop him from being able to manipulate everyone anyway. He is often portrayed smiling slyly and laughing mischievously, though he may look very harmless and innocent at first glance. he can speak very sweetly, even flirty and claiming he loves the other person very much, while during other moments he can speak in a very crude and nasty manner (especially towards Miu) and use insults which vary from quite harmless to very mean-spirited. He can also try to use his looks to his advantage and sheds crocodile tears by crying loudly like a scared and threatened child, telling the others they're being really mean, but this is always overly dramatic and obviously fake. There are also moments when he appears scared but it's unclear if he is being genuine or just trying to earn sympathy with his looks. There are also moments when he suddenly falls asleep and snores comically, angering the others.
Fitting his appearance, Kokichi often acts notably child-like. He is sometimes shown to have child-like excitement and innocence, as he gets very excited about "cool" new things. Kaede considered him exhausting and like a child who wants attention with bad behavior. He often acts playful and seemingly appears more ignorant than malicious during the first time he meets K1-B0. His Research Lab had a stereotypical dramatic throne of an evil ruler, comical instead of harmful objects, flashy cars and was even described to be like a child's idea of what an evil supreme leader is.
Above all, Kokichi considers lying a big part of himself and a way of life, appearing either unwilling or unable to stop it and even claiming that his body is made up of 70% lies. He frequently claims something only to shortly afterward reveal that he was just lying, making it very hard to trust his word. Sometimes the lies are very obvious, but at other times it can be near impossible to tell whether or not he is telling the truth. He also tends to say whatever riles up the other students at the moment and tries to mess up conversations without any apparent reason. He has also frequently pointed out that even if he told the truth, the others wouldn't believe a liar like him, indicating that he uses his constant lying to mask his own true feelings and intentions. Furthermore, being a liar himself, he always seems to notice when and why other people are lying. Ironically, he appears annoyed if other people are lying, either to others or themselves, and he claims that he hates liars. He also dislikes it when people claim they hate lying yet they lie. He sometimes does not point out other people's lies and may even go along with them simply for the fun of it, but he seems to enjoy revealing other students' more serious dishonest ulterior motives with near malicious glee. Notably, whenever his face and tone goes more blank and neutral, it's heavily implied that he has a rare moment of being completely genuine and honest, and he has an occasional habit to unintentionally speak out loud what he is genuinely thinking and sometimes even does it intentionally by openly explaining it to the other students.
Besides lying, Kokichi is shown to be very intelligent in general, with he himself claiming that his head is always filled with complicated thoughts. Supposedly because of his intelligence, Kokichi strongly disliked boredom. He tended to complain about situations he found boring and even during some bad situations he noted that it's fine because at least it's not boring. If he liked a person or found them interesting, he tended to state that they are not boring, which was a big and rare compliment coming from him. Furthermore, his last words even include a prominent line "At least I... wasn't boring, right?", showing that the matter appears very important to him. In general, he also seems to have an interest in "useful" people and wishes to have such people around him. It's implied that contrasting his intelligence, his weakness might be his physical strength. He dislikes heavy physical work and sports and complains whenever he has to participate in such activities, and he himself admits multiple times that he is weak physically. He also appears fearful whenever others threaten to hurt him, often running away quickly or relying on Gonta for protection. At one point he hides in the casino from Kaito and gets startled by Shuichi's appearance as he mistakes him for Kaito for a second. However, it should also be noted that he was seen as incredibly agile by Maki when he punched Kaito and he further claims that he lied about not being good at fighting, so it is unclear just how capable he really is when it comes to a fight. He claims that as an evil supreme leader, he doesn't like violence and would rather sneak around.
While Kokichi claims that his arguments are simply based on logic, he appears to have some sort of trust issues. He once told Kaede that he is more nervous around friends who share too much than strangers. It has been pointed out by other characters such as K1-B0 and Kaito that Kokichi does not like to talk about himself nor be open about his true feelings. he indicated that he is heavily suppressing his true emotions by saying all you have to do is hit the reset button and you'll feel happy again. He appears to have little trust in anyone or anything, refusing to tell anything about himself.
Indeed, despite all of his flaws, Kokichi is stated to have certain innocence which makes him hard to hate. Overall, he often appears to have good intentions, but acts on them in a harsh and confusing manner. He himself has claimed that he lies in order to entertain others and that his lies are told half out of kindness
https://danganronpa.fandom.com/wiki/Kokichi_Oma#:~:text=Kokichi%20Oma%20(%E7%8E%8B%E9%A6%AC%20%E5%B0%8F%E5%90%89,High%20School%20Level%20Supreme%20Leader)