The young Prince of Silverland, Knight 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 Knight, later in the series she is able to go about as a girl (wearing a blonde wig) in the persona of the Princess, Prince Knight's sister. In this way she is able to court Prince Frank.
- Princess Knight 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 Knight 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.
- Princess Knight will make her first appearance in Tino Tonitini Goes to Treasure Planet.