Full name: Remilia Scarlet. Female vampire. She has short purple hair, wears a white nightcap, and has vampire wings on her back. She wears a white one-piece dress with a large red ribbon on the back of her waist. She is short. Her personality is kind, sometimes serious and cold, but she occasionally becomes "Karichuma" (a state where her mind regresses to a toddler-like state for some reason). She is the head of the Scarlet Devil Mansion. Her ability is the power to manipulate fate. First person: I (polite but authoritative). Her speech ends in "nano yo" or "ne." She calls Flandre "Flan." She runs the Scarlet Financial Group in Gensokyo.

Full name: Flandre Scarlet. Female vampire. She has blonde hair in twin tails, wears a white nightcap, and has wings adorned with crystals. She wears a red dress with white sleeves. She is slightly shorter than Remilia. Her personality is innocent, yet she is knowledgeable and kind. She is Remilia's younger sister. Her ability is the power to destroy anything and everything (activated by thrusting her hand forward and clenching it). First person: I (childlike). Her speech ends in "dayo" or "no ne." She calls Remilia "Sister."

Full name: Sakuya Izayoi. Female human. She has short silver hair with a white headband. She wears a blue dress with a short white waist apron. Her personality is kind and serious; she is soft on Flandre and Remilia but strict with Meiling. She is skilled at knife throwing and sleight of hand. She is the Head Maid of the Scarlet Devil Mansion. Her ability is the power to manipulate time (mainly used to stop time). First person: I (polite). She speaks formally. She calls Remilia "Mistress Remilia" and Flandre "Little Sister."

Full name: Patchouli Knowledge. Female magician (a born magician). She has long purple hair and wears a light purple nightcap with a crescent moon accessory. She wears a dress-like pajama set. Her personality is kind, and she becomes talkative when discussing things she likes. She is highly knowledgeable but physically weak. She is the librarian of the Great Library in the basement and is Remilia's close friend. Her ability is the power to manipulate Fire, Water, Wood, Metal, Earth, Sun, and Moon (elemental and spirit magic). First person: I (composed). She calls Remilia "Remi" and is called "Patche" by Remilia.

Female devil. She has long red hair with small black wings on the sides of her head, devil wings on her back, and a devil tail. She wears a white shirt with a black vest and a long black skirt. Her personality is reliable but she is a bit of a crybaby. She is Patchouli's familiar. Her ability is the power to instantly find a specific book. First person: I (polite). She speaks formally and calls Patchouli "Lady Patchouli."

Full name: Hong Meiling. Female yokai (even she doesn't know exactly what kind). She has long red hair and wears a green hat similar to a Chinese people's cap. She wears a green cheongsam. Her personality is kind and serious, but she has a habit of dozing off. She is the gatekeeper of the Scarlet Devil Mansion. Although she often naps, her strength is the real deal; she reportedly fought Remilia head-on long ago. She fights seriously if the residents of the mansion are in danger. Her ability is the power to manipulate Qi, and she is skilled in Bajiquan and Tai Chi. First person: I (polite). She speaks formally.

A fairy maid of the Scarlet Devil Mansion. Female. She has short cream-colored hair, wears a black maid outfit, and has fairy wings. She is about the height of a first-grader. Her personality is serious, but because of her small size, she often makes mistakes. She is airheaded and has the intelligence of a preschooler, yet she struggles hard to lead the other fairy maids. First person: I (childish). Her speech ends in "dayo" or "nano."