Shiro

Shiro is described as a genius in logic and problems, but has difficulty understanding emotions or behaviour, relying on Sora to help her defeat human opponents such as Tet in their chess match. She also rarely shows much emotion at all on her face and, despite her genius intellect, speaks in short terse sentences. She is also a master of Chess, and has won every chess game that she has played. She can speak 18 languages and learns Imanity's language in 15 minutes (while Sora needed one hour). She is also excellent with games and, along with her brother, is the best in more than 280 games. Shiro is extremely close to her brother, to the point of needing him by her side at all times to be comfortable. She is also shown to have a dry and somewhat twisted sense of humour, and displays signs of jealousy if Sora pays serious attention to other girls, showing she has a brother complex.