When Z-one lost his arms and legs in battle against the Meklords, Anintomy never left his side. When Z-one created metal limbs for himself, it was a very painful process to install due to attaching each nerve in his arms and legs to the limbs to make them work like a real limb, Antinomy, again never left Z-one’s side.
Z-one never show his emotions to anyone, not even Antinomy. he keeps them all bottled up, so Antinomy cries for him and when Z-one sees Antinomy crying, it breaks his heart. They are very close because of all the horrors they have been through.