Clara Oswald
From Tardis Wiki, the free Doctor Who reference
Clara was a human living on 21st century Earth.
She was one of the three known people who the Eleventh Doctor claimed were one and the same, along with Clara Oswin Oswald and Oswin Oswald.
At some point in her life, she and her friend visited a graveyard, where she walked by the tombstone of 19th century Clara Oswald and ironically stated, "I don't believe in ghosts". (TV: The Snowmen)
