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Illustration of Koakuma in Strange Creators of Outer World
Library of Scarlet Devil Mansion
(小悪魔 Koakuma) is a devil where she's seen around the library of Scarlet Devil Mansion where she apparently lives in the mansion. Her sole game appearance is as the fourth stage midboss of Embodiment of Scarlet Devil, and little is known about her. In an interview with ZUN there was an implication that she was summoned as a familiar. In addition to this, its been stated that Vampires are capable of summoning lesser devils or familiars.
ZUN stated that she has a capricious, mischievous, and without second thoughts personality. 
Her exact role is difficult to tell, but she is believed to be an assistant in Patchouli Knowledge's library. She is seen carrying books in the library in all the print works she appears in.
Koakuma has no official name; this was confirmed by ZUN very early on . The commonly used name in the fanbase is Koakuma (小悪魔), meaning "Little Devil" or "Imp". ZUN used this term in an answer of the response to the question from the fans, while again stating at the same time that she was unnamed, though he did have rough sketches for a face sprite as well as plans to give her spell cards.
The sprite of Koakuma in Embodiment of Scarlet Devil shows that she wears a black dress with white sleeves. She has a small pair of black, bat-like wings on the sides of her head and long red hair.
- Embodiment of Scarlet Devil
The heroine first looks through a dim library. Koakuma ambushes the heroine, but she is quickly defeated.
- Patchouli Knowledge
Assumed to be Patchouli Knowledge's assistant.
Koakuma with Lily White and Daiyousei from Who's Who of Humans & Youkai - Dusk Edition
- In one of Embodiment of Scarlet Devil's sprite sheets, it shows Koakuma had an appearance in the Extra Stage sprites. It's just because the same image was taken from the stage 4 sprites, with a color overlay on the whole image.
- Koakuma is one of the few characters that doesn't appear in Hopeless Masquerade as a background character. The reason is unknown.
- ZUN's former blog "Touhou Shofu" 6 - "性格は２面ボスと似たところも多く、気まぐれでいたずら好き、後先考えずに行動します。" (Their personalities are similar to those of the two-faced bosses in many ways: capricious, mischievous, and without second thoughts.)
- ZUN's reply to messages on the former Gensou Bulletin Board 1
- ZUN's former blog "Touhou Shofu" 6
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