Furst

Fürst (フュルスト) was a major antagonist in Taigaia vs. Senryuukaku and a powerful high-ranking demonic magical priest who worked with NOMAD for a long time.

Taigaia vs. Senryuukaku
Furst is a high-ranking demon who was formerly the Marquis of the Asmodian Republic (アスモディアン魔共和国の侯爵) before being banished for his crimes and joining NOMAD soon after, who became an elite staff member who has cooperated with Edwin Black for turning Oboro into a demonic minion for a long time. He was also the one who taught Sabato Kiryuu demonic medical technology from the Underworld.