Kokichi is voiced by Derek Stephen Prince

However, I am happy for him to be voiced by a girl using a young boy's voice.

Kokichi is a young man with an innocent look and a rather refined face. He has a short stature, a thin build, and very pale skin. He has purple eyes and moderately long, wavy blackish purple hair. In the official art book, it is stated that he does not seem to care about his hair and the hair style is a result of him playing with it—however, he does sometimes make use of the shadows his bangs form to make himself look evil.

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.