Hans Christian Andersen

Hans Christian Andersen was a human writer of fairy tales. The First Doctor claimed to have given him the idea for one of his stories, The Emperor's New Clothes. (TV: "Conspiracy")

Barbara Wright mentioned Andersen while looking in a book while she was a prisoner in 1190. (TV: "The Knight of Jaffa")

Isaac Summerfield II read Andersen's stories to his daughter Bernice when she was a child. (PROSE: The Pit)

As proven by the actions of Nereus, mermaids were only peaceful in the world of Hans Andersen. (AUDIO: Cryptobiosis)

Behind the scenes
According to The Brilliant Book 2012, Andersen was available on social-networking sites and was friends with Charles Dickens in River Song's World.