Mary Shelley
The author of Frankenstien and The Last Man, Mary Shelley met a future version of the 8th Doctor in 1816 at the Villa Diodati. When a version of him several years younger appeared, she travelled with him, fighting Cybermen, witches and an army of the living dead. While Mary hasn't travelled for very long, she has become a seasoned traveller in time and space, standing up for what is right every time.