Primary

• Mephisto Pheles Brother of Amaimon
• Mephisto Pheles Half-brother of Rin Okumura
• Mephisto Pheles Half-brother of Yukio 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 Twin Brother of Rin Okumura
• Yukio Okumura Older Version of Yukio Okumura (child)
• Yukio Okumura Half-brother of Amaimon
• Yukio Okumura Half-brother of Mephisto Pheles
• Amaimon Master of Behemoth
• Amaimon Half-brother of Rin Okumura
• Amaimon Brother of Mephisto Pheles
• Amaimon Half-brother of Yukio Okumura