The term 'Twain Title Character' refers to characters from the works of Mark Twain. The first character is Tom Sawyer, the protagonist of the novel 'The Adventures of Tom Sawyer'. He is a mischievous boy who lives in the fictional town of St. Petersburg, Missouri. The second character is Jim, also known as the FROG of Calaveras County, from the short story 'The Celebrated Jumping FROG of Calaveras County'. He is a slave who helps Tom and his friends on their adventures. The third character is the Prince and the PAUPER, two boys who look identical but come from different social classes. They switch places and experience life in each other's shoes. The fourth character is Huckleberry Finn, the protagonist of the novel 'The Adventures of Huckleberry Finn'. He is an orphaned boy who embarks on a journey down the Mississippi River with his friend Jim.