She is not a very big character for the series, only a few times Lena appears. Born from a government family she tries not to be part of it and takes the road to become a gamer. Noui is responsible for Lena's mishaps but that does not stop her from escaping him all the time. Its unclear if she wants to be a gamer or not, the glasses on her might make her change her career.
Her powers are unclear, and little information was given from the game.