Suou's father

Suou's father is a minor character from the Persona 2 duology. He is the father of Katsuya and Tatsuya. In the original versions of both games, he is only mentioned by other characters. He eventually makes his appearance in the additional scenario of the PSP remake of Eternal Punishment. Either way, his first name is never explicitly given in any version.

Story
According to Chief Togashi and Captain Shimazu, Suou's father was an elite police officer and Togashi's partner 10 years ago until he was investigating the arson attacks and pinpointed Tatsuya Sudou. Because Tatsuya Sudou is the son of the Japan's Foreign Minister, Tatsuzou Sudou, he bribed Togashi to frame Suou with a false charge and threw him into the jail. This incident greatly depressed the Suou brothers. Tatsuya has become introverted and rebellious (in Innocent Sin this is fueled even more because he was stabbed by Tatsuya Sudou and believed his mother figure, Maya Amano, was burned to death during the Alaya Shrine attack). Katsuya has abandoned his dream of pastry chef and become a police officer in order to clean his father's name.

PSP remake additional scenario
In episode 2, "Lone Shadow 2", Suou's father is seen wearing a security uniform and discussing with Shiori Miyashiro about her knowledge of his sons and the Maya's activities. They are both aware of the existence of the Persona ability.