This is Avatar: Generations, based on the popular Nickelodeon animated series Avatar: The Last Airbender.
Subsequent updates will feature other minor characters from The Last Airbender such as Avatar Kyoshi, as well as characters and storylines from Avatar: The Legend of Korra.
The game aims to satisfy fans of the series and RPGs whilst also being accessible to newcomers according to Will Moore, CEO of Navigator Games.
The game is being developed by Square Enix London Mobile in partnership with Navigator Games, and is described as a “free-to-play, RPG adventure”.