Umbra Sankari

A Freischltz teammate that year and a hell of a nerd in her spare time, she joined the team after being invited by someone inside.
Seven's team could even try, but the team that invited Sankari was fully assembled to win every game. Sankari has a frightening knowledge of JRPG
(RPG style chosen for that year's competition).

She's part of the reason why Seventh couldn't win; an important person to him, who left her to go on with the gamer life only to lose to in the future. Umbra Sankari duels in RPG as a cruel dictator.