Primary

• Muramasa Spirit of Koga Kuchiki

Extended

• Koga Kuchiki son-in-law of Ginrei Kuchiki
• Koga Kuchiki uncle-in-law of Byakuya Kuchiki
• Koga Kuchiki uncle-in-law of Hisana Kuchiki
• Koga Kuchiki uncle-in-law of Rukia Kuchiki
• Koga Kuchiki owner of Muramasa