The anime "Huckleberry Finn Monogatari" adapts Mark Twain's "Adventures of Huckleberry Finn," centering on characters including Huckleberry Finn, Jim, Tom Sawyer, the Duke, the King, Pap Finn, Widow Douglas, Miss Watson, and supporting figures like the Grangerfords and Shepherdsons. Voice actors feature Yōko Matsuoka as Huckleberry Finn, Chie Satō as Jim, and Kumiko Nishihara as Becky. No character named Billy appears in the series, its source material, or associated plot summaries and character descriptions.