In most fiction, characters’ lives are limited to the individual work. Readers may disagree on the characteristics and traits of fictional figures, and in drama there is room for different interpretations of characters. However, it is less common for characters in literary fiction to reappear in subsequent works than in genre fiction, where series featuring the same central characters are common. This is even more pronounced in comics, which are typically serialized in newspaper strips or comic books. Thus characters introduced in the 1930s, like Superman and Batman, may still enjoy new adventures decades later. During these characters’ long histories, they change in various ways for a variety of reasons. If a character is created by a single author, like Sherlock Holmes, the character’s core traits may change little from story to story, but readers learn more about him with each successive story. On the other hand, if characters are the work of several hands over decades, they may change considerably.