Daitokuji
Daitokuji is head of the Osiris Red dorm and teaches alchemy at the academy. He has a cat named Pharaoh who is almost always with him.
Daitokuji is later revealed to be Amnael and a member of the Shadow Riders. Although he supports the protagonists for most of the first season of the series, he is directly responsible for numerous events meant to orchestrate the revival of the Sacred Beasts.
Daitokuji’s original goal in life was to create the Philosopher’s Stone.