Age: 25
Height: 179cm
Weight: 65kg
Zodiac Sign: Capricorn
Initial Persona: Helios
Ultimate Persona: Hyperion

Katsuya Suou is Tatsuya Suou's older brother, a by-the-books sergeant from the Konan Police Department who followed in his father's footsteps to become a cop. He awakens to his Persona during the incident at Seven Sisters High School, along with Maya Amano and Ulala Serizawa. He uses his standard-issue semi-automatic pistol to defend himself, and his Persona grants him fire magic.
While investigating the Joker Incident in Seven Sisters High School where a student allegedly performed a curse on someone, Katsuya unwittingly runs into a madman who claims to be the Joker wearing a makeshift paperbag mask. (who turns out to be Tatsuya Sudou, whose memories were restored by Nyarlathotep) Upon claiming responsibility for killing Kaneda (The person who ran over Anna Yoshizaka) and Principal Hanya, Katsuya tries to arrest him but is overpowered by demons and the Joker Persona. It is around this time that he feels the resonance, and awakens to Helios. With the school soon being overrun by demons, he advises Maya and Ulala, who have also awakened to their own respective Personas, to stay with him until the incident is resolved, allowing them use of the familiar pink pistols that the Joker flung at them before attacking. Ulala refuses, since she could do just fine with her fists, so Maya takes them both, and seems particularly comfortable with using the guns.