They are a playable race in the game, known for their long, pointed ears, graceful appearance, and connection to nature. While they are not specifically from an anime, they have been adapted into the anime world through Final Fantasy XIV: Shadowbringers, which features the Viera in its story and animation.
However, there are no anime specifically focused on a character named Viera. If you are thinking of a different anime or character, please provide more context, and I'll be happy to help!