Nakuru Akizuki

A servant created by Eriol, appearing from the Sakura Card Arc. Blood type AB. Born on October 13. Favorite and best subject is mathematics. Favorite flower is the Queen of the Night. Favorite color is red. Transfers to Seijou High School as a classmate of Touya and Yukito. Has a bright personality and often hugs Touya, causing him trouble. In true form, has long crimson hair styled in a chignon, wears clothes with black and red as the main colors accented with butterflies, and has butterfly wings with crimson spots. Symbol is the moon. Has excellent athletic ability but does not belong to any specific club.

Attracted to Touya's magical power and targets him, viewing Yukito (the Moon) as a rival. Therefore, interferes with Touya when he tries to tell Yukito the truth and provokes Yukito when Touya is not around. Even after Touya loses his magical power, continues to interfere with the two and teases them, seeming to enjoy this relationship.

Prefers the appearance of a beautiful girl, so wears a girl's uniform, but Spinel suggests wearing a boy's uniform. According to the character, gender is not a significant issue since they are not human. Unlike Yukito (the Moon), retains the same mind and memories in both temporary and true forms. In battle, attacks with hand strikes or launches pink crystals (the latter only in the anime).

In the Clear Card Arc, returns to Japan for the same reason as Spinel and transfers to the same university as Touya and Yukito through Eriol's arrangements, staying at Yukito's house. The form of Ruby Moon had not appeared for a while but reappeared in Volume 12.

The name model is Nakuru Yamatani, a friend of the original creators and an employee of Kodansha. Her name originates from Lake Nakuru in Kenya.