サファイア, Prince, Princess, Aiko Sekiei, Eri Imagami, 今上エリ
The young Prince of Silverland Sapphire is in reality a girl but must pretend to be a boy in order to inherit the throne and prevent the evil Duke Duralumon from taking power. Her personality is more refined than tomboyish but shes good with a sword and at night fights crime as the masked Phantom Knight. Shes goodhearted has a strong sense of justice and is competent and levelheaded as well. Although most of her time is spent as Prince Sapphire later in the series she is able to go about as a girl wearing a blonde wig in the persona of the Princess Prince Sapphires sister. In this way she is able to court Prince Frank. Source: Wikipedia