His descent into outright madness was compounded partly because of the vicious rumors other students would spread after him, making him even more unstable and volatile than before. He developed a deep affection towards Kashihara, who acted as a substitute father in the place of Tatsuzou Sudou because the latter only regarded him as a disgrace Kashihara thought that Sudou's voices were direct messages from the Maiyan aliens and wrote them all down into the book In Lak'ech. He also heard " voices" in his head, which made him even more nervous. He was a nervous, timid boy who was terrified of his cruel father. Tatsuya Sudou was a senior at Seven Sisters High School when Akinari Kashihara was teaching history there. Tatsuya Sudou is the son of Tatsuzou Sudou, Japan's Foreign Minister. In fact, his insanity results in him willing to commit any degree of crime in order to take revenge on anyone who stands in his way including his father and Tatsuya Suou, and is thus highly dangerous and impossible to reason with. He is also quite delusional and unstable due to the visions his voices had him see, making him an ideal candidate to spread destructive rumors. In both realities, his personality is the same despite taking different roles being insane, quick to anger, apathetic, cruel and has no qualms of sacrificing anyone, including his subordinates to achieve his goals.
Persona 2: Eternal Punishment: Antagonist, as JOKER.Persona 2: Innocent Sin: Antagonist, as King Leo.