Clara Oswald

Clara was a human living on Earth at some point after the 19th century.

She was one of the three known people whom the Eleventh Doctor believed to be 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)