Kurosu Etsurou
The protagonist of the series.
- The Peeping Tom: What he becomes after accidentally creating a peephole into Rio's apartment bedroom. Unfortunately, this eventually backfires as he discovers Rio's big secret.
- Real Men Wear Pink: Not the most masculine person, but he says he loves pink enough to change his name to "Momosu", instead of "Kurosu".
- Secret-Keeper: He willingly keeps secret Rio and Reina's disturbing activities even though he doesn't approve.
Rio Miyaichi
- Bitch in Sheep's Clothing: She comes off as a shy, anti-social girl but is really a ruthless serial killer.
- Blue-and-Orange Morality: Rio would be fine only killing people who are lefties or have hit a home run. She just so happened to decide on mainly killing criminals for no particular reason.
- Enfant Terrible: She started killing when she was 12.
- Gotta Kill Them All: Played mostly straight. She has a list of people she desires to kill, often with notes for why should die. Unfortunately for her boyfriend, Kurosu, he's also on the list. However, she's not against killing people not on the list.
- Living a Double Life: To most, she's an attractive, anti-social college student. This belies her serial killer lifestyle, of which only a few know.
- Sadist: Rio clearly enjoys her killings, sometimes making her main character boyfriend an unwilling pawn in luring in victims, often at the expense of his own health and safety.
- The Sociopath: She is a mostly unrepentant serial killer. While she claims to kill only criminals, she also makes it clear that she's perfectly capable of killing anybody she feels like, and at one point randomly kills a police officer for no apparent reason aside from simply not liking his tone of voice while he was questioning her about another killer (while she herself wasn't under direct suspicion at the moment), and even justifies her actions by saying that cops aren't people.
- Straw Nihilist / The Social Darwinist: When Kurosu asks why she kills, she reveals some pretty messed up views on life and death in a diatribe about living things passing on their genes, to which she asks "Is there even any point to that?" In short, she believes that if living and dying are equivalent, then killing must be the same. Although she then undercuts it by admitting she "doesn't really know why she does it."
- Villain Protagonist: Miyaichi, our female protagonist, is an unrepentant and proud serial killer.
Reina Enmeiji
Miyaichi Rio's acquaintance who helps her dispose of bodies by chopping them up and making them into her "gothic horror" furniture. Self-proclaimed artist, designer, collector, and smuggler.
- Deadly Distant Finale: Makes it all the way to the final chapter fifteen years later, only to be murdered by Kurosu and Miyaichi's grown son.
- Full-Frontal Assault: Since she's a nudist, this tends to happen.
- Gag Penis: She's apparently well endowed.
- I Love the Dead: She finds living people disgusting and tells Kurosu that maybe he's not so bad if he likes sleeping with corpses from when she found him unconscious and stuffed in a car trunk with a body.
- Nightmare Fetishist: You'd kind of have to be to build furniture out of bones.
