Silver Surfer

The Silver Surfer was, by some accounts, a real person, (COMIC: Party Animals, The Incomplete Death's Head) although some others seemed to depict him as a fictional character. (TV: The Return of Doctor Mysterio, COMIC: Selfie, etc.)

Biography
He once attended Bonjaxx's birthday party at Maruthea, wearing a party hat. (COMIC: Party Animals, The Incomplete Death's Head)

Behind the scenes
Dan Slott's was explicitly inspired by Doctor Who, including giving the Silver Surfer a companion named Dawn Greenwood: "[W]hen Tom Brevoort and I first talked about doing the Surfer book, we both approached it from the same angle. We both said, "Wouldn't it be neat if you did a soft reboot the same way Russell T Davies did a soft reboot of 'Doctor Who?'" All the past continuity stands, but here's a nice new way to look at it. The basic element we wanted to "borrow" -- STEAL! [Laughs] was giving the Surfer a human companion; someone that grounded him, because for the most part you look at Surfer and he's this Shakespearean-spouting guy from the top of a bowling trophy. It's hard to literally get under his silver skin. Giving him a human companion though, a character who's eye-level to the reader, grounds him. As much as this book is about exploring the universe, it's also about exploring the Surfer's humanity."