Lily Arwell

Lilly Arwell was the daughter of Madge and Reg Arwell and the elder sister of Cyril Arwell. After Cyril's disappearance into the forest world, Lily and the Eleventh Doctor (whom she called 'the Caretaker') initiated a search for him. There, they encountered the Wooden King and Wooden Queen.

Until her mother arrived and her strength became apparent, Lily was chosen by the King and Queen to help save the Androzani trees and transport them to safety. (DW: The Doctor, the Widow and the Wardrobe)

Personality
She occasionally finds her little brother irritating and remains wary of his long words. But she loves Cyril and when he travels into the forest, even when she learns of the danger ahead, Lily doesn't pause for a moment in her pursuit of him. When the Doctor first encountered her, Lily had developed a slightly prickly persona, possibly due to the fact that her father was away at war. But she quickly took to the mysterious man in the bow tie, unable to keep a smile from her face when he unveiled his modifications to their holiday home. And when Madge told her children to stay away from the 'caretaker', Lily was the first to announce, 'I like him!' Clearly, whatever faults she may have, she's a great judge of character.