Primary

• Rin Okumura (child) Twin Brother of Yukio Okumura (child)
• Rin Okumura (child) Younger Version of Rin Okumura

Extended

• Rin Okumura Twin Brother of Yukio Okumura
• Rin Okumura Older Version of Rin Okumura (child)
• Rin Okumura Half-brother of Amaimon
• Rin Okumura Half-brother of Mephisto Pheles
• Rin Okumura Son of Satan
• Yukio Okumura (child) Twin Brother of Rin Okumura (child)
• Yukio Okumura (child) Younger Version of Yukio Okumura