Hakkai Shiba is the younger brother of Taiju Shiba and a member of the 10th Generation Black Dragon in Tokyo Revengers. Despite his large stature and strong fighting abilities, Hakkai is kind-hearted and deeply protective of his older sister, Yuzuha. He struggles under Taiju’s abusive leadership, often feeling trapped by his brother's dominance. Loyal and determined, Hakkai’s journey involves finding the courage to stand up against his brother and protect the people he cares about. His internal conflict and growth make him a compelling and pivotal character in the story.