Sam is an escaped slave encountered by the protagonist during their travels. His background involves having fled enslavement, defining his circumstances at the story's start. He forges a key alliance with the main character and another companion, Oyuki, collaborating closely as they journey across various regions, with this partnership conveyed through action rather than extensive dialogue or personal history.

Sam actively participates in critical narrative events, including boarding Captain Drasnic's vessel for passage to America. His involvement continues during the subsequent treasure hunt on Santa Catalina Island, where Captain Kidd's hidden wealth is the central objective. Driven by a desire to combat oppressive forces, Sam aligns with the protagonist's goal of undermining the antagonist Tenkai. During the climax, he utilizes the acquired treasure to support a military campaign against Tenkai's faction. His role centers on participation in the core journey and its strategic outcomes.