Thomas "Tom" Sawyer is the title character of the Mark Twain novel "The Adventures of Tom Sawyer" (1876). He appears in three other novels by Twain: "Adventures of Huckleberry Finn" (1884), "Tom Sawyer Abroad" (1894), and "Tom Sawyer, Detective" (1896).
Tom Sawyer appeared in four different Mark Twain books over the course of 15 years. 
He appeared in four books over the course of 20 years. 