Mark Twain was an outstanding American in the 19th century. His novels and diary were loved by readers. The following are some of the characteristics of his characters: Truthfulness: Mark Twain's novels are usually based on real characters. His descriptions are so vivid that the readers can feel the characters 'personalities, emotions, and experiences. Humor: Mark Twain's novels often have humorous elements. His humorous style is very unique and often makes people laugh. Complex characters: The characters in Mark Twain's novels are often very complicated. They have different backgrounds, personalities, and motives. The author shows their complexity by describing their conflicts and interactions. Irony: Mark Twain often used irony to express his novels, which often surprised the readers. 5. Attention to social issues: Mark Twain's exploration of social issues was very deep. His novels often revealed some problems in American society, such as racial isolation and class contradictions. In general, Mark Twain's character creation was very unique. Through vivid descriptions and complex relationships between characters, readers could deeply understand American society and human nature.