Drei serves as an aide to Aria Rosenburg within the antagonistic organization Logos, bearing a German numerical codename translating to "three," indicative of his standing within the group's hierarchy.

Driven by research, he frequently views opponents as subjects for study. His core objective centers on investigating the mechanics and potential applications of the five Artifacts' power. This research focus appears to be his primary motivation, creating ambiguity regarding his true loyalty to Logos; his commitment remains uncertain as he pursues his investigative goals rather than demonstrating clear allegiance to the organization's broader aims.

Drei wields magical abilities, specializing in combat summons of dark spirits, aligning with his role as a Logos magician. He is later revealed to hold significant authority as one of the organization's four wisemen.