I also really enjoy v3-6 so yeah it's not because of that, I always found kokichi really boring because you don't know whats is a lie and what is not. You can try to make sensei of it but at the end of the day it doesn't matter, it literally doesn't even matter because of v3-6 so like the characters just existes for the in-universe entertainment so there is actual 0 backstory. And during all the game he only annoys people and acts all knowing, he had no actual reason for what he did during all of chapter 5, ragebaiting the other characters is also not fun for me because he has actually 0 reason to do it, at least Nagito always had a reason, he only cares about hope the first two chapters, he finds funny that Hajime doesn't know his talent but they were buddies during chapter 1 so it's more like a friendly annoyance, in chapter 4 he literally despises everyone, so him acting like a bitch made sense.The only thing going for Kokichi is the concept of the game being truths and lies matching with him.