Primary

• Alouette Younger Version of Prairie
• Alouette Adoptive sister of Ciel
• Alouette Friend of Zero

Extended

• Prairie Older Version of Alouette
• Zero Friend of X
• Zero Teammate of Axl
• Zero Enemy of Sigma
• Ciel In love with Zero
• Ciel Creator of Copy X
• Ciel Enemy of Dr. Weil
• Ciel Commander of Cerveau
• Ciel Commander of Rouge
• Ciel Commander of Joan