Yoko Ono
From Jenny Everywhere Wiki
Yoko Ono was the wife of John Lennon, one of the Beatles. One “fictional” (though still, somehow, real) incarnation of Jenny Everywhere pondered the possibility of sleeping with both Yoko and her husband a short time before her assassination by the villainous writer Sizemore. (PROSE: Paperback Writer)
Behind the scenes
By virtue of being an actual real-world figure, Yoko Ono can be considered a public-domain character in his own right.