Kokichi is a manipulative and elusive person who presents himself as an evil supreme leader. He is child-like in his demeanor, loves games, and takes pride in his lies and questionable actions. He possesses exceptional intelligence, often creating complex plans quickly, and has a deep understanding of complex situations. Despite his weakness in physical strength, he is agile and can hold his own in a fight. He has a penchant for analyzing others and hoarding evidence.

Nishishi.

Shuichi Saihara is a quiet and reserved detective with a deep sense of justice and a strong desire to uncover the truth, no matter how difficult. He is determined and driven, with a good eye for detail and a strong sense of deduction. His past experiences have shaped him into a cautious and guarded person, but he can still be friendly and trusting with those he is close to.