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There's not really an offical backstory for him, but many fans assume that he was bullied. They also think he had a bad home situation. He would get pushed around by older kids on the playground and never spoke to anyone. Some fans believe that his parents fought so much that they never noticed him. But whatever his backstory is, he starts a cult. It was more of him being an edgy teenager with some friends he had that were just like him. He lied a lot during the trials and told everyone that he killed the person when he didn't, just to get on everyone's nerves and throw them off.
Kockichi is an annoying brat who likes to make everything harder than it needed to be. But thats what made me like his character. He's kind of childish and he's always smiling. He thinks that he's the king of the school, he's quite entitled.
Sadly, he's one of the participants who didn't make it. He gets killed by being crushed. He was killed by Kaito Momota at the end of chapter 5.
His goal is to have people fear him for some reason. He wants to be respected and feared which isn't possible.
I didn't really care for him at first, but when I played the game over again, I came to love his character. He caught my attention because of his rivalry with Miu Iruma. He says snarky comments about her and she fights back. They share an amusing relationship.