Teddy Duncan is a fictional character from the Disney Channel series Good Luck Charlie. She is portrayed as a teenage girl who documents her family's daily life through video diaries. Teddy is known for her upbeat personality and her role as the eldest sibling in the Duncan family. In the show, Teddy navigates the challenges of adolescence while balancing her responsibilities at home. She often interacts with her parents, Bob and Amy Duncan, and her younger siblings, including Charlie, whom she cares for and loves dearly. Teddy's character emphasizes themes of family, friendship, and growing up.