Koakuma - Touhou Wiki - Characters, games, locations, and more

Koakuma (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.

Touhou Pocket Wars 2nd/Characters/Koakuma - Touhou Wiki

Koakuma, Wiki

Koakuma - Touhou Wiki - Characters, games, locations, and more

Koakuma, Wiki

Koakuma (Scarlet) Touhou LostWord Wiki - GamePress

Keine Kamishirasawa from Touhou Project

Touhou Character Guide - Forums

Touhou Koumakyou: the Embodiment of Scarlet Devil - The Cutting

MUGEN FEMALE TOU HOU X DATE A LIVE GIRL by SOGODOSE on DeviantArt

Touhou Unreal Mahjong Characters - Giant Bomb

koakuma and koakuma (touhou and 1 more) drawn by rotte_(1109

Koakuma (Compendium of Advanced Magic)

Touhou Hijacks in the Outside World (@TouhouHijackLOL) / X