"Mr. Fox" is a fictional character created by author Roald Dahl in his children's book titled "Fantastic Mr. Fox." He is a clever and resourceful fox who lives with his family in a burrow. Mr. Fox is known for his cunning nature and ability to outsmart his enemies, particularly the three farmers: Boggis, Bunce, and Bean. In the story, Mr. Fox steals food from the farmers to feed his family. When the farmers band together to catch him, he devises a plan to outwit them. The tale highlights themes of family, bravery, and cleverness, making it a beloved classic in children's literature.