~Sanzu Haruchiyo~

Spoilers for later manga arcs.

Sanzu Haruchiyo is defined by extreme loyalty, volatility, and a willingness to use violence. He tends to treat loyalty as absolute: he attaches himself to people he trusts—especially Mikey—and reacts to perceived betrayal with frightening intensity. That devotion can look like respect or protectiveness, but it becomes dangerous because he rarely questions the harm done in its name. He is less a calm strategist than someone whose choices are driven by fixation and powerful emotions.

His relationship with Mikey is central to understanding him. Sanzu follows Mikey with almost religious commitment, and his actions suggest that Mikey’s approval and well-being matter deeply to him. At the same time, that devotion is not the same as healthy care: Sanzu helps enable Mikey’s destructive impulses rather than restraining them. His loyalty gives him purpose, but also narrows his moral world.

Visually, Sanzu is striking because of the contrast between polished, composed styling and disturbing details. He has light-colored hair, expressive eyes and long lashes, and is often shown in sharply dressed gang or criminal-organization outfits. Earlier, he wears a mask that hides his mouth; later, the prominent scars at the corners of his mouth become part of his recognizable appearance. The scars make his smiles feel unsettling, reinforcing the gap between his attractive, carefully presented look and his capacity for cruelty.

Overall, Sanzu is compelling as a character because his loyalty is both his strongest trait and his greatest flaw: it gives him emotional focus, but makes him willing to abandon empathy and judgment. His appearance echoes that contradiction—stylish and controlled on the surface, with hints of menace underneath.