Leona Michella Lion is a four-year-old lioness cub. She is the younger sister of Lionel, and the daughter of Theo and Cleo. In the first two seasons, she is performed by director, co-creator, and writer, Kathryn Mullen (who also acted as puppet captain), while later by Pam Arciero (both and Anthony Asbury were well known for Allegra's Window).
As she is still young and learning to read, some irregular forms of words she thinks are regular (e.g. in "A King and His Hawk", she says "hided" when she is referring to hiding a book, and Lionel says the word is "hidden").