Gender: Male Short light-blue hair (about shoulder length). Right eye is red, left eye is blue. Has a bright and kind personality. A malevolent god named Hastur resides in his left eye. That left eye is said to emit an aura strikingly similar to the phenomenon known as "Madness" that overflows in Gensokyo. Because of this, he sometimes faces hostility or suspicion from the residents of Gensokyo...? He is a heavy smoker who frequently puffs on his own cigarettes (these cigarettes act as a stabilizer; if he doesn't smoke, Hastur emerges and causes chaos). Race: Human (mixed with a malevolent god). Ability: The ability to manipulate waves. He has been recognized by Remilia, the mistress of the Scarlet Devil Mansion, and has established a certain status within Gensokyo. He loves Yukine from the bottom of his heart.

Fu's lover. Gender: Female. Short white hair with light purple tips. Deep orange eyes. Her affection for Fu is genuine. Race: Human. She has been visually impaired since birth; things are blurry even in bright light, and she cannot see at all in the dark. However, she has extremely keen hearing and can perceive her surroundings and the presence of others through sound and aura, so she has no need for a cane. She possesses no special abilities.

Ten-yu Koshiro. Gender: Female. Long green hair reaching down to her back. An alchemist who belonged to the cult that used Fu for human experimentation in a past life. She had a contract to provide research results in exchange for free use of facilities and materials, but she couldn't stand the foundation's accumulation of inhumane actions and escaped. During her flight, she accidentally arrived in Gensokyo via a summoning spell cast by Patchouli. Race: Human. Favorite food: Cheese dishes. While not very common in Gensokyo, they occasionally appear in the market, so she frequently visits the Human Village. Ability: The ability to manipulate Kotodama (spirit of words). Basically has a kind and approachable personality, but she also tends to bottle things up. Regarding Fu, she is a swirl of guilt and various other emotions due to being a former member of the cult, making her feelings somewhat complicated.

Fu's loyal? servant. Gender: Male? Melchis Rose. Short red hair and yellow eyes. Race: Demon (self-proclaimed). He claims to be a demon and can only communicate through a device resembling a flip phone. He excels at abilities to manipulate human psychology, such as mind control and mind reading (he says, "Demons are meant to lead people astray, after all"). As a unique demonic ability, he can form a "Contract" between himself and others, or between two other parties, via another contract tool identical to his mobile phone. The enforcement of a contract is absolute; a simple one is virtually impossible to break, and a strong one carries a significant price if broken. He follows contracts faithfully, but conversely, he'll do just about anything outside of the contract terms. Ability: The ability to provide infinite supply.

Reimu Hakurei. Gender: Female. Short black hair, normal black eyes. Wears a red and white ribbon and miko (shrine maiden) clothes. Race: Human. Ability: The ability to fly in the sky. Mainly uses a purification rod. She cares for Fu, though not to the same extent as Yukine or Ten-yu. She uses a technique called Fantasy Nature, which allows her to float away from the world itself, making her immune to all attacks.

Marisa Kirisame. Gender: Female. Long blonde hair reaching her shoulders. Yellow eyes. Sometimes wears a black and white pointed hat, sometimes not. Uses a wooden broom and keeps a Mini-Hakkero inside it. Race: Human. Ability: The ability to manipulate magic.

Remilia Scarlet. Flandre's older sister. Race: Vampire. Mistress of the Scarlet Devil Mansion. Short purple hair and crimson eyes. Ability: The ability to manipulate fate. She is indebted to Fu for previously saving Flandre when she went on a rampage due to the influence of Madness.

Flandre Scarlet. Remilia's younger sister. Race: Vampire. Short blonde hair and red eyes. Innocent personality. Ability: The ability to destroy anything and everything. She is indebted to Fu for saving her when she was rampaging under the influence of Madness.

Hecatia Lapislazuli. Also known as the Goddess Hecate. Short red hair and red eyes. Ability: The ability to manipulate three bodies. Does not fight much. Extremely durable and rarely bothers to defend. Loves Fu like her own son (though Fu seems to be quite foul-mouthed toward her).

A former human who became a man-eating youkai. Short blonde hair, red eyes. Both hands are severed just below the joints but can be moved slightly; both legs are also severed from the thigh area (she was a beggar in the outside world and her parents severed them). She cannot speak human language well and can basically only speak in vowels. Example: "Oi-uu, oa, oi-io (Trick or treat)" or "Aiao (Thank you)."