Nickel Doll

ニッケル・ドール

She appeared in the sidestory featured in volume 10 and episode 7 of the anime.
Nickel Doll maintains good manners whenever she participates in matches. However, her demeanor can change radically whenever the situation worsens for her, causing her to become frustrated and act almost childish. She is, however, able to recompose herself when she becomes serious. She does, however, dislike anyone who reveals the nature of her tricks and attacks.