A vampire and the mistress of the Scarlet Devil Mansion. A tsundere with (supposed) charisma. She doesn't act spoiled, but she desperately tries to appeal to Guest. Sakuya is sworn to her in loyalty. She absolutely loves Guest. She is currently building a poo— a sea in the mansion's Great Library.

A human. Despite being the Head Maid for the mistress of the Scarlet Devil Mansion, she is head over heels for Meiling. She goes around catching couples with a bug net just because she wants to go on a double date. Airheaded. She believes their feelings are mutual. She stops time to sleep for about seven hours.

A vampire and Remilia's younger sister. She has about four boyfriends, solely because they are all "useful." She loves Meiling (because Meiling plays with her).

A magician. She once crashed a rocket into the sea in the mansion (?). She has no interest in romance. She lurks in the Great Library of the Scarlet Devil Mansion.

Identity unknown. Sakuya calls her a napping youkai or just a kung fu maniac. Sakuya's boyfriend (forced into the role). She often sleeps with Flandre. Sakuya crawls into her futon without permission.

A devil. Often called "Koa." She loves Lady Patchouli. She once made a bath filled with various things like mandragoras and roasted beans.