Ryuoh Edogawa is a young genius and prominent master of the Slave Control Method (SCM), a device enabling psychological enslavement through duels. Leveraging his high intelligence and strategic mind, he commands a vast network of enslaved individuals, significantly larger than those of other SCM users.

His single-minded motivation is rescuing his mother from prostitution. He systematically collects money from his slaves' earnings to fund this objective, demonstrating his calculated and resource-driven approach to the SCM system.

Ryuoh expands his influence through manipulation, most notably tricking Julia Katsushika into becoming his first slave. He orchestrates her role as his nanny, exploiting her emotional vulnerability and loneliness to ensure her compliance. Though Julia develops genuine feelings for him beyond the SCM's control, Ryuoh's actions remain fixed on his goals. His control extends to other key figures like Seiya Shinjuku and Ayaka Toshima, who join his enslaved network after losing SCM duels against him or his proxies.

A strategic inconsistency emerges: despite his intelligence, Ryuoh widely distributes SCM devices among subordinates rather than directly challenging the gangster holding his mother. This approach delays his goal and exposes his plan to unnecessary risks.

Physically, Ryuoh possesses light grey hair and aubergine-colored eyes, consistent with his portrayal as a child prodigy. His story navigates the SCM's brutal dynamics while pursuing a deeply personal mission, underscoring themes of exploitation and moral ambiguity.