Soga acts as a key strategic advisor to the warlord Raoh, offering counsel during military campaigns across the wasteland. He is the brother of Reina, a military officer under Raoh who becomes romantically involved with the warlord. This familial tie positions Soga at the intersection of personal and political loyalties, especially as Reina’s relationship with Raoh intensifies. His narrative involvement centers on Raoh’s relationship with Reina—a storyline expanded in this adaptation—where Soga likely mediates and influences the dynamics between them. His role unfolds within the adaptation’s Holy Emperor arc, though his actions are tied mainly to Raoh’s internal struggles and romantic subplot rather than the central conflict between Kenshiro and Souther.