Suchan Seba functions as Midori Okuike's butler and Hand Shaker partner. His history before partnering with Midori remains undisclosed, though Reijiro Araki remarks on Seba’s uncharacteristically rough demeanor for a butler. Seba originally endorsed Midori's childhood aspiration to aid the Okuike Group by harvesting precious metals from the Ziggurat dimension through self-inflicted wounds. However, when Midori's father placed greed above his son's welfare, forcibly extracting the metals and jeopardizing Midori's life, Seba took action. He killed Midori's father and associates to rescue Midori. After this incident, Seba devoted himself entirely to advancing Midori's objectives, including the acquisition of Yukiya Araki's power. He maintains unwavering loyalty throughout the series, consistently aligning his actions with Midori's goals.