Kousaka, Rui

黄坂ルイ

She is best described as a "cool" girl. Although Rui shares the same surname as Minami, they are in fact not related at all. Rui was placed in Minami's care after her father, Cole Window, the former chief of Heavens' recovery team, died avenging his friends. Minami treats Rui as if she were her own daughter. During the Venezuela arc, when Rui first appeared, she repeatedly challenged Aoba to become the main pilot of the Moribito. The two became friends through this process, but their rivalry never ends. Rui pilots the Nana-Two Way Custom alongside Minami during the Venezuela arc, but she switches to the Nana-Two Mild in the Tokyo arc.