Posy Stickle was a young female hedgehog resident of Mossflower Woods. She was the sister of Ferdy, Coggs, and Spike, and the daughter Ben and Goody Stickle. Posy and her brother Spike were very fond of Riverwyte, who played with them and whom they called "Uncle Mask".
The pair never learned Mask had been killed by Tsarmina Greeneyes because the otter's dying wish was that they be told he simply moved away. Posy and Spike occasionally masqueraded as Ferdy and Coggs in order to fool Tsarmina.
Not to be confused with Posybud.