The audience first meets Toph Beifong in Avatar: The Last Airbender, where she is a young girl that Aang, Katara, and Sokka come across during their travels who agrees to teach Aang earthbending ...

Avatar: The Last Airbender and The Legend of Korra have introduced six avatars, and each one of them had their own elemental preferences and power.

Over the course of Avatar: The Last Airbender and The Legend of Korra, strong benders of all types are introduced, but earthbending might have some of the strongest benders.

It is also likely that this new protagonist in Avatar: Seven Havens has needed to lean on her Earthbending for survival in the post- Legend of Korra world.