Kazuma

Kazuma is Kazuma Kuwabara, Yusuke Urameshi's classmate, rival, and closest human ally in Yu Yu Hakusho.

Kazuma Kuwabara's role in Yu Yu Hakusho

He begins as a delinquent who repeatedly challenges Yusuke, but their rivalry develops into a loyal friendship during battles involving demons and the Spirit World.

Spirit Sword, loyalty, and human courage

Kuwabara's spiritual awareness lets him form the Spirit Sword, while his compassion and refusal to abandon friends make him the emotional center of the main team.