The 101 Most Influential People Who Never Lived:

The 101 Most Influential People Who Never Lived: how characters of fiction, myth, legends, television, and movies have shaped our society, changed our behavior, and set the course of history by: Allan Lazar, Dan Karlan & Jeremy Salter
Non-fiction: Humor, History, Lists, Pop Culture 314 pages
Book Count: 13

As the book itself points out there are a number of people in this book who are legendary.  Some of them are known to be real people, but most of what we "know" about them can not be proven and some may or may not have existed.  But in either case not all of the "fictional" characters in this book are fictional.  Also a number of entries include editorializing on what the person represents and how people should feel about this.  Besides that the idea behind the book was intriguing.  The entrees include info on where the character was from, what their story was, and ways that they influenced the world.