Toph Beifong is a major character in the animated series 'Avatar: The Last Airbender.' She is a blind earthbending prodigy from the wealthy Beifong family. Despite her blindness, Toph developed seismic sense and became one of the most powerful earthbenders in the world, inventing metalbending. She joins Aang and his friends as the group's earthbending teacher, showing resilience, independence, and wit. Toph is crucial to Team Avatar’s success, contributing her strength and unique perspective to their journey.