Rapunzel

Rapunzel was a fictional princess who was the protagonist of a fairy tale, noted for having extremely long hair.

Jamie McCrimmon encountered Rapunzel in the Land of Fiction, where he climbed her hair to escape a clockwork soldier. She was put off by his telling her that he was a piper's song, having expected him to be a prince; however, she relented and let him in anyway. Rapunzel later assisted the Second Doctor in his battle against the Master of the Land. (TV: The Mind Robber)

Martha Jones met Rapunzel on a world created by a Ch'otterai who used the fictional books Martha had read throughout her life to create it. As Martha climbed her hair, the Tenth Doctor told her to tell Rapunzel "hi" for him as he had met her before. (PROSE: The Mystery of the Haunted Cottage)