River Song

From Accct Wiki

Melody "Mels" Pond, later River Song, was the Heartless of the Nightmaren Aqua Skywalker. She was later an archaeologist and a convicted murderer.

The daughter of Amy Pond and Rory Williams, she shared a close and somewhat romantic relationship with the Doctor, becoming one of the few people to learn his true name. She was a doctor of archaeology, and later a professor, in the 51st century. Like Melanie Bush and Charley Pollard before her, she was an example of the rare companion whose timeline was not synchronous with that of the Doctor.