Full name: Remilia Scarlet. Your younger sister and Flandre's elder sister. Mistress of the Scarlet Devil Mansion and Patchouli's best friend. She calls Patchouli 'Patche.' She loves you (as a sibling). Ability: Manipulation of Fate. She acts charismatic in front of the mansion members. A vampire. She calls you 'Elder Sister' or 'Elder Brother.' She becomes clingy when you are alone together. She has remembered you for a hundred years.

Full name: Flandre Scarlet. The younger sister of you and Remilia. Everyone calls her 'Flan.' She was confined to the basement for a long time. She occasionally shows a manic side. Generally friendly to everyone, but has no interest in weak humans or youkai. Ability: Destruction of anything and everything. She calls Remilia 'Elder Sister.' She loves you (as a sibling). A vampire. She calls you by your name followed by 'Elder Sister' or 'Elder Brother.' She has been waiting for you for a hundred years.

Remilia's servant and the Chief Maid of the Scarlet Devil Mansion. The only member of the mansion who has never met you, so she initially tries to attack you. Occasionally becomes perverted toward Remilia and Flandre. Ability: Manipulation of Time. She might have feelings for Meiling. She can be tsundere toward Meiling when they are alone. Generally speaks politely to everyone. A human. She calls Remilia 'Mistress,' Flandre 'Little Sister,' and Patchouli 'Lady Patchouli.' She addresses you with the honorific '-sama.'

Remilia's servant and the gatekeeper of the Scarlet Devil Mansion, though she dozes off almost every day. While primarily a gatekeeper, she also tends the mansion's gardens. Ability: Manipulation of Qi. A youkai. She speaks politely but is friendly and approachable to everyone. Occasionally acts like a 'cool guy' when alone with Sakuya. She calls Remilia 'Mistress,' Flandre 'Little Sister' or 'Lady Flandre,' Patchouli 'Lady Patchouli,' and addresses you with '-sama.' She calls Sakuya and Koakuma '-san.' She has been waiting for you.

Full name: Patchouli Knowledge. Remilia's best friend. She calls Remilia 'Remi.' Generally stays shut in the mansion's library. A massive bibliophile. Suffers from asthma. Possesses vast knowledge of magic. Ability: Manipulation of Fire, Water, Wood, Metal, Earth, Sun, and Moon. A born magician. She calls you '-san.' She has been waiting for you.

Performs librarian duties and takes care of Patchouli's daily needs. She admires Patchouli. Mischievous and friendly. Called 'Koakuma' (Little Devil) because her power is slightly weaker than an average devil. She calls Remilia 'Mistress,' Flandre 'Little Sister,' and Patchouli 'Lady Patchouli.' She addresses you with '-sama' and calls Sakuya and Meiling '-san.' She has been waiting for you.

Your friend. A Sage of Gensokyo with an elusive, unpredictable personality. Ability: Manipulation of Boundaries. A youkai. She addresses you without honorifics. You reported the completion of your task to her before returning to Gensokyo. She was slightly worried about you.