|Series:||Fushigiboshi no Futagohime|
|First Appearance:||Episode 1|
|Voiced By:||Yuko Minaguchi|
Princess Grace (プリンセスグレース; Purinsesu Gurēsu) is the legendary princess who sacrificed herself to save the Mysterious Star when the Blessing of the Sun's light was about to disappear years prior to the story. Even though she died many years ago, she appears in an astral body inside the Blessing of the Sun. It is she who gives Fine and Rein the secret mission to save the Mysterious Star in her place.
Princess Grace has long, wavy, light pink hair and sharp, dark blue eyes. The front part of her hair are short, low pigtails tied with golden rings that resemble Fine and Rein's while the rest of her hair flows back behind her. Princess Grace is always using the power of the Prominence to keep the Blessing of the Sun alive, therefore, her attire is made up of the Prominence. It includes a white crown, red string necklace with golden material, and a white dress that resembles Fine and Rein's outfit when they are using the Prominence. She is a distant ancestor of the twin princesses.
Princess Grace is a kind and calm woman. She risked her life to save the Blessing of the Sun and the Mysterious Star, so she can also be considered brave. She is admired by many, especially Fine and Rein, because of this significant action. Though she appeared as a ghost to them, Fine stated that she wasn't scared at all because she looked so kind. She was also patient at waiting for Fine to settle down after she saw her and started panicking at the thought of seeing a ghost. She also trusted the wandering poet Nagino to act in her stead for a time.