The main character of the anime. Despite having no wish or drive to be an Eternal Girl, and being a complete beginner at the game, she was chosen as a selector. Her reason for battling is simply for the thrill and excitement from it. Ruuko is very caring and thoughtful to the others around her to the point she was willing to lose her battle with Yazuki and Hitoe in order for their wishes to come true. Her LRIG is Tama.
At first she does not have any wishes.
Later it is revealed that unknowingly she has been wishing to be able to play WIXOSS and battle other Selectors as she takes great joy from it. When the time to make has come though, her final wish was to be able to free the LRIGS from their cards to return them to their normal lives.
In season 2, Iona replaces Tama as Ruuko's LRIG