Reyna Aguilar - Yui’s girlfriend. She also goes to WCU, and is a member of the GSA.
Riyoko Nishimura - Yui’s mother and Nishimura No. 34’s twin sister. She keeps her sister and nephew as indentured servants, and is all around strict in her enforcement of magus practices.
Rumika Nishimura (Nishimura No. 34) - Midori’s mother and the original heir to the Nishimura family. Rumika, like with Midori, is a nickname given by Yui.
Rafael Cruz - Yui’s father, a magus from a powerful Spanish family, who married into the Nishimura family to increase this generation’s Magic Circuit capacity.
Josue Trujillo - A Hispanic mage with a Sealing Designation. Julia was sent to capture him, but she really has her eyes on a special power that he possesses.
Himushi and Kinpika Nishimura (Nishimuras No. 35 and 36) - Yui and Midori’s distant cousins. They were found and inducted into the family before Midori’s birth, hence their numbers. They both use gem-based magecraft.
Louise Tepes - Eugénie’s girlfriend, a mage trapped in a castle in England. She mainly serves as motivation for Eugénie; she has no bearing on the events of the Grail War.