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Castor Gemini is a winged who serves as one of the 12 Archangels of the Zodiac, who works alongside his sister Pollux to fulfill their role as Messengers of the Monarchy. He and his twin are fourth in rank among the Zodiac.

His given title is the Angel of Axis.


Within the Zodiac, he and his twin share a mutual attachment with Kaisei, and are the target of a one-sided enmity by Asoriza. His role implies a connection with the current monarch.


  • Castor "can speak", but "cannot see". His twin sister is the opposite.
  • Castor's eyes (bottom left in image) appear to be different from his sister's, and from every other winged's regular orange color. His eyes bear a resemblance to the queen's golden eyes, however.