- Protagonist / The Phantom: The player character, a delinquent who moonlights as a gentlemanly thief. Wears a bird mask and wields knives and pistols.
- Ryuji Sakamoto: A yellow-haired boy who attends the Protagonist’s school and joins him in his heists. Wears a skull mask and wields bludgeons and shotguns as weapons.
- Anne Takamaki: A blonde girl in the Protagonist’s homeroom, who joins him in his heists. Wears a cat mask and uses whips and submachine guns.
- Morgana: A shapeshifting cat-like creature that meets the protagonist at the start of the game and joins him in his heists; has some sort of connection to the Seven Deadly Sins and will play a key role in the story. Wields swords and slingshots.
- Twin Assistants: Two young assistants to Igor in the Velvet Room. They both wear an eyepatch over one of their eyes and a blue prison guard outfit. One has a long braid, the other hair buns.
- Iwai Munehisa: Owner of the Military Shop “Untouchable”.
- Tae Takemi: Owner of the Takemi Medical Clinic.