Final answer:
Made-up characters are not a feature of both fiction and literary nonfiction; they are unique to fiction, as literary nonfiction must portray real people.
Step-by-step explanation:
The element that is NOT a feature of both fiction and literary nonfiction is B. made-up characters. In fiction, characters can be entirely the product of the author's imagination, while literary nonfiction involves real people and events. While story events, realistic dialogue, and a central idea are common to both fiction and nonfiction narratives, made-up characters are unique to fiction. In literary nonfiction, the characters are based on real individuals, and the truthfulness of these character representations is essential to the genre's credibility.