Kunta Kinte
Kunta Kinte is a character from the 1976 book Roots: The Saga of an American Family that was later adapted into a 1977 TV miniseries that was extremely popular. In the show, the character was played by LeVar Burton. While he was probably based on a real person, Kunta Kinte himself was not a real person.
Helen of Troy
As stated in Marlowe’s Doctor Faustus, Helen of Troy was “the face that launched a thousand ships.” Allegedly the most beautiful woman in the world, it doesn’t seem likely that she actually existed, but it merely a character in Homer’s epic poem The Iliad.