The term 'Twain Character' refers to characters created by the American author Mark Twain. The crossword solutions for this term include 'Huck' (4 letters), 'Sawyer' (6 letters), 'PAUPER' (6 letters), 'Huckfinn' (8 letters), 'Huckleberryfinn' (15 letters), and 'Puddnheadwilson' (15 letters). These characters are all featured in some of Twain's most famous works, such as 'The Adventures of Tom Sawyer', 'The Adventures of Huckleberry Finn', and 'Pudd'nhead Wilson'.