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 she's good with a sword and at night fights crime as the masked Phantom Knight. She's good-hearted, has a strong sense of justice and is competent and level-headed 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 Sapphire's sister. In this way she is able to court Prince Frank.
- Princess Sapphire will meet Pooh, Thomas, Twilight Sparkle and their friends in Pooh's Silverland Adventure where she, Choppy and Prince Frank all join the team at the end of the film.
- Princess Sapphire will also appear in Thomas and Pooh's Grand Adventure: The Search for Christopher Robin, Thomas' Adventures of Freddie as F.R.O.7.,Thomas the Tank Engine Meets the Hunchback of Notre Dame, Thomas' Adventures of Osmosis Jones, Thomas' Adventures of The Princess Diaries, Thomas' Adventures of The Tigger Movie, Thomas' Adventures of Piglet's Big Movie, Thomas and Pooh's Hefflalump Movie, Thomas' Adventures of Winnie the Pooh (2011) and Thomas' Adventures Chronicles.
- She will make her first appearance in Tino Tonitini Goes to Treasure Planet.