- 0 - The Fool
- Tohru Adachi: "Impulsivity" - A detective stationed in Inaba, and Enoha's boyfriend. While Katsuya feels that Adachi can be immature at times, he has seen what the older detective can be capable of in a crisis. Around Adachi, he also harbors an immense feeling of guilt.
- Yu Narukami: "TBA" - TBA, I swear
- I - The Magician
- V - The Hierophant
- Ryotaro Dojima: "Perseverance" - An older and more experienced detective at the Inaba Police Department. Adachi's partner. Katsuya has a good deal of respect for him and his position.
- Shinjiro Aragaki: "Discipline" - A ranking member of SEES. While he's been impressed by the young man's dedication and care for those under him, he feels he's too reckless with his life. After an investigation that took him right into Shinjiro's TV dungeon, the detective had questions... and learned what Shinjiro had done in the past.
- VII - The Chariot
- VIII - Justice
- IX - The Hermit
- XI - Strength
- Enoha Koinose: "Reunion" - Katsuya's former classmate from his high school years, and Adachi's girlfriend. Her determination and cheerfulness were things he came to admire about her. She is one of the people in his life he cares about the most; this is highly unlikely to change for him, regardless of what happens. However, sometimes it's difficult to be around her, no matter how much he seeks to kill his feelings.
- Jason R. Butler: "Opposites" - A private investigator and business-owner, working with Department 4. While he and Katsuya are about as different as can be, they generally get along socially and have become friends. They don't always agree on things, though...
- Masahiko Irie: "Insoluble" - A young yakuza heir. After watching Masahiko sink further into a criminal lifestyle, Katsuya has decided that he'll have no more to do with the young man that he thought could change and escape his destiny.
- XII - The Hanged Man
- Rui Onishi: "Mystery" - The daughter of Shinichi Onishi, an infamous criminal and former surgeon, and employee of Daisuke Itami. Despite their first couple encounters leading to his humiliation, he's come to worry about her, especially given what things he has learned about her and her life. He despises her father intensely.
- XIV - Temperance
- Naomi Suzuno: "Inescapable" - A good friend of Tatsuya's. He told her, at her request, a few things about Tatsuya's history. He's personally of the opinion that her feelings for his brother go deeper than just friendship, but this might be wishful thinking on Katsuya's part.
- Shion Katsuragi: "Regression" - Katsuya's former partner in when he was assigned to Inaba. She has since quit her job as a detective and declared the law useless, much to Katsuya's dismay and frustration. He's bound to be even less-than-pleased when he finds out where she's ended up...
- XV - The Devil
- Daisuke Itami: "Tension" - A private investigator/information broker. May have ties to the Yakuza, though where and who is uncertain. A troublesome man, but he had proven himself useful in the past, though Katsuya is loathe to speak to him more than absolutely necessary.
- Leigh Anne O'Hara: "Bewilderment" - The medical examiner at the Sumaru Police Department. She has a history with Jason. She quite easily knocks Katsuya out of his comfort zone; she is capable of making him very uncomfortable with disturbing ease. Every time he thinks he understands her, she does something shocking that proves otherwise.
- XVI - The Tower
- Mikiya Ryouhara: "Skewed" - A young man who has taken it upon himself to create a world free from corruption. He despises the government. To that end, Katsuya and he have clashed, with dire consequences for the officer that don't end with himself.
- XVIII - The Moon
- Maya Amano: "TBA" - TBA, I swear
- Yoko Nakashima: "Enlightenment" - A girl who resides at a home for the mentally ill. He's taken personal responsibility for her given that she possesses a Persona while grappling with a mental illness, and has tried to do his best to be a role model for Yoko given that she has none in her life.
- XIX - The Sun
- Tatsuya Sudou: "TBA" - TBA, I swear
- Tatsuya Suou: "Movement" - Katsuya's younger brother. Though it would be false to say that everything is just fine between them now, the spark for actually understanding his sibling has been struck following a rather violent altercation between them. Of course Katsuya won't stop worrying about Tatsuya any time soon, but he's resolved to have faith, and do what he can to help his brother.
- XX - Judgement
- Hajime Shidou: "Guidance" - A fellow detective and a father. Despite the fact that Hajime is just barely his younger, Katsuya has taken up the role of the senior about the younger man. He worries about exposing him to the supernatural at the same time that he feels the need to respect the man's position as a detective and with Department 4.
- Nagisa Renge: "Silence" - A young woman who Katsuya had been giving baking lessons, and who he had learned was dying. He was never able to thank her properly for saving his life; she had passed away from her illness before he could contact her.
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