Primary

• Kazuma Kuwabara Younger Brother of Shizuru Kuwabara
• Kazuma Kuwabara In love with Yukina
• Kazuma Kuwabara Teammate of Hiei
• Kazuma Kuwabara Teammate of Shuichi Minamino

Extended

• Hiei Twin Brother of Yukina
• Hiei Teammate of Kazuma Kuwabara
• Hiei Teammate of Shuichi Minamino
• Shuichi Minamino Friend of Yusuke Urameshi
• Shuichi Minamino Friend of Yomi
• Shuichi Minamino Teammate of Hiei
• Shuichi Minamino Teammate of Kazuma Kuwabara
• Shuichi Minamino Teammate of Genkai
• Shuichi Minamino Rival of Karasu
• Yukina Friend of Kazuma Kuwabara
• Shizuru Kuwabara Older sister of Kazuma Kuwabara