Primary

• Hildegard Servant of Kaiser de Emperana Beelzebub IV
• Hildegard Twin sister of Yolda

Extended

• Kaiser de Emperana Beelzebub IV Young Master Hildegard
• Kaiser de Emperana Beelzebub IV contracted to Tatsumi Oga
• Kaiser de Emperana Beelzebub IV Younger brother of En
• Yolda Twin sister of Hildegard
• Yolda Servant of En