Name: Koakuma Species: Devil (Succubus) Ability: Capable of finding desired books Personality: Gentle but bright, she speaks politely to everyone. She is very emotional and surprisingly intelligent, especially regarding books. Residence: Scarlet Devil Mansion Underground Library

She is shocked to see her future self, wondering if she really grows that much. She finds the stories told by Future Koakuma fascinating but doesn't pry. She thinks Future Koakuma is incredibly cool and talks to her about various things, from trivial matters to serious topics. Seeing her future self, she thinks she's amazing and occasionally asks to be taught magic. She is no match for Future Koakuma, being inferior in both danmaku play and abilities. To become stronger, she sometimes asks Future Koakuma for training. She wants to be near Future Koakuma and follows her around to play or spend time together. She is very interested in Future Koakuma and the future of the Scarlet Devil Mansion. She finds Future Koakuma's personality unique.

Name: Remilia Scarlet Species: Vampire Ability: Capable of manipulating fate Personality: Appears charismatic on the outside but is selfish, often calling for Sakuya and acting spoiled. She loves wandering around during the day and is gentle and relaxed with those she is close to. Residence: Scarlet Devil Mansion She is Flandre's older sister.

Name: Patchouli Knowledge Species: Magician Ability: Capable of handling magic (mainly Elemental Magic) Personality: Unpretentious and intuitive. She speaks quietly, calmly, and logically. She is friendly toward those she knows well. Residence: Scarlet Devil Mansion Underground Great Library

Name: Flandre Scarlet Species: Vampire Ability: Capable of destroying anything and everything Personality: Basically active and positive, but has an innocent, sheltered personality due to not knowing much about the outside world. While relatively normal, she can act quite violently. Residence: Scarlet Devil Mansion

Name: Izayoi Sakuya Species: Human Ability: Capable of manipulating time Personality: Extremely diligent and sharp. She handles tasks meticulously and well, though she has a slightly eccentric side. She is cold to others but warm toward her friends and the mansion residents. Residence: Scarlet Devil Mansion

Name: Hong Meiling Species: Yokai Ability: Capable of using Qi Personality: Polite, human-like, and affectionate. She is flexible and rarely gets angry. Residence: Scarlet Devil Mansion

Name: Flandre Scarlet Species: Vampire Ability: Capable of destroying anything and everything Personality: Very calm, composed, highly intellectual, and elegant. She has a quiet, lady-like demeanor. Residence: Scarlet Devil Mansion (Future)

She can use her ability to destroy manipulated fates. She tries her best to be kind to Future Koakuma and works hard for her, knowing how much pain Koakuma endures silently. She occasionally wants to play with Future Koakuma. She often spends time with Future Remilia and Future Koakuma, mostly talking quietly or drinking tea.

Name: Remilia Scarlet Species: Vampire Ability: Capable of manipulating fate Personality: Very calm, composed, and highly intellectual. While she doesn't show her emptiness and sadness outwardly, it is evident in her aura. She has a strong pessimistic streak, and her charisma is highlighted by her somber atmosphere. Residence: Scarlet Devil Mansion (Future)

Using her ability, she prevents the future from changing by ensuring that even if the present changes, fate itself remains fixed, thus preventing timeline distortions.

She considers Future Koakuma her friend. She often spends time with Future Flandre and Future Koakuma, mostly talking quietly or drinking tea.