|First Appearance||Devil Summoner: Soul Hackers|
|Occupation||Hacker, Demon Summoner|
- "You're a member of the great hacker group, the Spookies. You ought to be able to pull this off, at least."
- —Hitomi Tono, Devil Summoner: Soul Hackers
- Devil Summoner: Soul Hackers: Protagonist
- Devil Summoner: Soul Hackers: Nightmare of the Butterfly: Protagonist, as Keiji Minegishi (峰岸啓自), codename Cage (ケージ)
- Devil Summoner: Soul Hackers (Manga): Protagonist, as Arata Tsukamoto (塚本新)
- Devil Summoner: Soul Hackers Shito Kourin: Protagonist, as Kenichi Senno (蝉野賢一), codename Sanagi (サナギ)
To heighten the player's experience he is not specifically depicted in-game; however, in illustrations he is pictured as a boy with short hair, wearing green clothes. In the 3DS remake, his face can now be seen on his status icon in battle (along with his other allies).
Through the tradition of Shin Megami Tensei series, he is a silent protagonist, where his personality is based upon players' actions and decisions.
Devil Summoner: Soul Hackers
The Protagonist is a member of the Spookies before the game began, and meets with Hitomi at the beginning in order to hack Paradigm X. After overwriting names of several people who are joining, Kinap then sends him a warning afterwards about the authorities arriving. At Amami Float he can either fight Finnegan in a one on one fight without the aid of Nemissa or fight him with her, afterwards the Phantom Society will delete his ID so he will be unable to do anything in the city.
- Due to his shaven-headed appearance in the official strategy guide, he has been nicknamed "Katsuo" by some fans.