Demon Mirror Horror Karma (魔鏡ホラー カルマ Makyō Horā Karuma?) is one of the Apostle Horrors who lives in a mirror rather than human hosts, though she can turn a human into a Horror familiar if their darkness is great enough. She consumes human souls by showing illusions of their greatest desires, drawing them into her mirror realm and turning their bodies into piles of broken mirror shards to ingest with their souls trapped in the mirror world. Among her victims are untold numbers of Makai Knights who came to slay her, only to be defeated and devoured. Karma is able to jump from mirror to mirror if the one she is currently housed in is destroyed. The sorrows and hatreds of people consumed by her are used for her as childlike Warashi (ワラシ?) and the shadowy Mercenaries of the Demon Mirror (魔鏡の傭兵 Makyō no yōhei?). Eventually, forced to fight Garo, Karma assumes a giant mirror-shard themed harpy form while trying to convince Garo to swear loyalty to her in return for immortality. However, empowered by the fallen Makai Knights' souls within the realm, Garo destroys Karma.
- Karma is portrayed by Saori Hara (原 紗央莉 Hara Saori?) and is voiced by Mika Hijii (肘井 美佳 Hijii Mika?).