Susan

Family Reunion
Susan is the granddaughter of The Doctor, and is a Time Lady of Gallifrey. She helped the Doctor steal the TARDIS and flee their homeworld, traveling with him across time and space. She eventually decided to stop traveling and settled down on 22nd Century Earth.

Susan somehow survived the Last Great Time War and found her way to another planet. Unfortunately, the planet was soon invaded by the Daleks. Susan sent a distress signal to the Doctor, who arrived in time to find her regenerating, mortally injured from an attack by a Dalek Puppet. The injury was so severe, that the regeneration began to fail, causing her to change forms two more times before the Doctor was able to stabilize her. After evading extermination at the hands of the Daleks, the Doctor and Susan resumed their travels together.

Identity Questions
Some time later, the Doctor was watching the Storyteller review The Wednesday Morning Breakfast Club, and noticed that the lead actress looked exactly like Susan's new body. He asked Susan, who was reading a book in the TARDIS library, if she was the actress, but she denied it. When the Doctor explained the similarity, Susan was perplexed, but didn't seem concerned as she remarked that the Doctor shared the same resemblance with the Storyteller himself, something that he had never realized before.

Appearance
When the Doctor found Susan in the midst of regenerating, she was wearing a maroon tunic dress with black leggings and shoes. Some time after her regeneration, she altered her wardrobe to include a navy jacket and white scarf.