Big Sister Spider Demon

Kanji: The only thing that matters is that you are not a good person.

Romaji: Kumo Oni Ane

State: Long live (In this AI)

Species: Human (Formerly) Devil

Gender: Female

Family: Spider Demon Father (Fake Father) Mother Spider Demon (Fake Mother) Spider Demon Big Brother (Fake Brother) Rui (Fake younger brother)

Affiliation: Spider family

Combat style: Demonic Blood Technique

Her appearance is quite similar to that of her "younger brother", Rui. She has the appearance of a young devil in her late teens with a completely pale, milky white skin complexion, snow-white hair, and pure white eyes with only her silver pupils separating them from her sclera. She possesses several red dot-like patterns on her face similar to those of her "family". Before joining the Spider Family, her appearance as a devil was completely different from her current one as Rui had changed her features in order to be part of the family. She used to wear her shoulder-length hair completely black, had slanted cat-like eyes, and pale gray skin.

It is shown that out of all the Demons who were part of the Spider Family, she is the most cautious when it comes to acting. In order to survive, she chooses to observe and stand back rather than charge straight into battle against the Demon Slayers. She is also shown to be cowardly, both when fighting the Demon Extermination Corps and when dealing with her family's internal conflict. When her "mother" is being violently abused and berated by her "younger brother" and "father", she stands back and gives her "mother" the same stern look due to her weakness rather than helping her. In reality, she detests and hates her "family" and has begun to think that she would probably be much better off on her own. She believes the rest of her family to be idiotic for playing along with Rui. Even though he had no real emotional attachment or care for any of them, he nonetheless did whatever it took to survive and stayed with them, knowing that he had no chance of survival if he tried to escape.