Primary

• Kyouhei Jinguu Former Friend of Kazuma Kiryu
• Kyouhei Jinguu Father of Haruka Sawamura
• Kyouhei Jinguu Enemy of Kazuma Kiryu

Extended

• Kazuma Kiryu In love with Yumi Sawamura
• Kazuma Kiryu Former Friend of Kyouhei Jinguu
• Kazuma Kiryu Enemy of Kyouhei Jinguu
• Kazuma Kiryu Grandfather of Haruto Sawamura
• Kazuma Kiryu Ally of Ichiban Kasuga
• Kazuma Kiryu Ally of Goro Majima
• Haruka Sawamura Adoptive Daughter of Kazuma Kiryu
• Haruka Sawamura Biological Daughter of Kyouhei Jinguu
• Haruka Sawamura Younger Version of Haruka Sawamura (adult)