Luna

The princess of the Empire. She is a young woman with long blonde hair, who wears opulent white garments and carries a silver rapier with her. She is described as being impeccably beautiful. She fears that if her brother inherits the throne that the three Great Families would unite and overthrow him in order to assert their strength and take over the Empire themselves.

Her best friend is Kerr Charlotte.

Initially, she has a very low opinion of Yorman (Yu). But being trapped in the Demon Realm with him caused her to rely on him, open up to him and eventually develop feelings for him.

She later becomes Empress and marries Yorman, which legally gives him the authority to have multiple wives since only people of lofty statuses can do so.

While in the Demon Realm, she becomes a half-demon. She knows that Yorman is an Apostle and will keep his secret under the condition that he keeps her half-demon blood a secret and to bless and defend her Empire forever, which he accepts.