TV-Series
Description
Douma, also known as Douma Hoshi, is an ancient and powerful priest who serves as a primary antagonist in the story. His background is deeply rooted in the supernatural conflicts of the Heian period, where he was originally the teacher of the renowned Makai Alchemist, Abe no Seimei. This role gave him significant influence and access to powerful magical knowledge, which he ultimately corrupted for his own ends.

In terms of personality, Douma is characterized by profound manipulation and a complete lack of morality. He is a sinister and calculating figure who views others purely as tools for his grand ambitions. His actions reveal a deeply predatory nature, as he took sexual advantage of his own pupil, Seimei, and placed a curse upon her that would have lasting consequences for her future. He is also a master manipulator, seen in his role as the mentor to another villain, Ashiya Douman, whom he shaped to be his successor in darkness.

Douma's primary motivation is the unleashing of ultimate chaos and destruction upon the world. He masterminds a long-term scheme to release the ancient and catastrophic Horror known as Rudra. To achieve this, he intends to trap his former student, Seimei, forcing her to become Rudra's vessel so that the entity may consume the entire world. This plan involves orchestrating a number of Horror attacks to destabilize the capital and further his goals. The curse he placed on Seimei is a key part of this design, as it feeds on her internal darkness, weakening her powers from within and making her more susceptible to his machinations.

Within the overall narrative, Douma's role is that of a hidden architect of the central conflict. Events that originally led to the blessing of Seimei as an alchemist are rooted in Douma's deceptive mentorship, for he was the priest who found and trained her after recognizing her lineage. His influence extends to his other disciple, Ashiya Douman, who carries on his plans to reawaken Rudra and plunge the world into darkness. Seimei's struggle against the curse and the efforts of the Makai Knights are a direct response to the legacy of evil he set in motion. Ultimately, his defeat is integral to the resolution of the story, as it allows Seimei to free Douman's soul from the darkness that controlled him, ending the cycle of manipulation.

Regarding key relationships, the most significant are his bonds with Seimei, whom he abused and cursed, and Ashiya Douman, whom he corrupted as a protégé. These relationships are defined entirely by his exploitation, marking him as a source of profound trauma for the protagonists.

While the full extent of Douma's magical abilities is not exhaustively detailed in available sources, several key powers are evident. As an ancient priest, he possessed formidable mastery over onmyōdō and dark magical arts. His most notable demonstrated ability is the placement of a powerful curse on Abe no Seimei that persists for years, feeding on her inner darkness. He is also capable of masterminding and facilitating complex rituals, such as the one intended to free the Horror Rudra from its seal. His power and knowledge are shown to be sufficient to act as a mentor to another powerful antagonist, Ashiya Douman.