o-Man is a NPC that can be found in The Mall's Flute Room. He is sitting on a sofa in a room which has a flute lying on the floor that gives the Flute effect. He looks like a purple "O" or "θ" with a single red eye on the center, and has 2 pink legs with light purple shoes, and has music notes coming out around him. If Madotsuki is using the Cat effect, he will act like angry or uncomfortable. Madotsuki can also kill him by using Knife effect and sit on his sofa, and the BGM of the room will stop and change to the Mall's BGM. He is similar with the e-Man in the previous room that has an insane Toriningen at the counter.
There is a single poster inside the Flute Room. It is of a weird creature with a single eye and 2 ears.
- The parallax background in the Graffiti World somewhat resembles o-Man and e-Man, indicating a recurring significance of the characters.