Kokichi describes himself as an evil supreme leader, and often uses this title as a reason for many things he does. 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. Among other things, his organization supposedly has covert agents in every country, control over all the mafias in the world, torture as a form of punishment, and Kokichi's defeated opponents apparently will get sent in Siberia. However, none of his claims have been confirmed, and the other students think he's either lying or delusional.

Voice reference: https://www.youtube.com/watch?v=0TpbyUusWf8&t=9s