Shiro

Shiro (白) is an 11 year old genius NEET (Not in Education, Employment, or Training), hikikomori (shut-in) gamer along with her step-brother, Sora which formed 『　　』. She is the main female protagonist of No Game, No Life. Sora's dad remarried thus making Shiro and Sora only step-siblings.

Appearance
Shiro is a pale-skinned girl with long messy light-blue hair and large, passive golden-red eyes. She is rather slim and about average height. She often wears a purple sailor uniform which seems to be very loose on her. According to Sora, Shiro is really cute.

Personality
Shiro is described as a genius in logic and problems, but has difficulty understanding emotions or behaviour, relying on Sora to help her defeat beings with emotions 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 and in a third-person perspective.

Shiro is 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. She is also not above teasing him about his mildly perverse tendencies. If Shiro is separated from Sora by so much as a closed door, she becomes almost catatonic until he returns to her. For this reason she does not bathe as she does not want Sora to see her naked and because she does not like her hair to be washed, but she can't separate from him far enough to not be seen.

Shiro also has a slightly sadistic side to her, which she usually keeps hidden. This is shown evident when she forces Plum to lick the sweat off her feet in order to regain her (Plum's) energy. Although he does not think too badly of it, Sora still can't help but be shocked every time he sees his sister act that way.

Strengths
Shiro has shown to be a genius with an almost supernatural intelligence. Sora has stated that she has beaten a Chess program written to beat a grandmaster twenty times in a row, and she herself has stated that chess is no different from Tic-Tac-Toe. It is also been stated by her brother that she fluently speaks 18 languages, and learned to read Imanity in 15 minutes. She is also incredibly skilled in First Person Shooters, able to predict the movements and bullet trajectories of her opponents.

Weaknesses
While a genius, Shiro has trouble dealing with the human aspects of games, reading human opponents and predicting their moves. A human player doing something unpredictable can unsettle and confuse her, and she relies on Sora to tell her when a human opponent is leading her into a trap, seen in their chess game with Tet. Her other weakness is her reliance on Sora. She can't be separated from him by as much as a door without falling into an almost catatonic state.

Trivia

 * Shiro means white in Japanese, possibly a reference to her albino appearance
 * Shiro and Sora's surname was said to be "Nai" by the author. This can be interpreted that their surname is literally Nai or that they have no surname, as Nai (ない) in Japanese means none (which is likely in reference to 『　　』).   It can also be interpreted as a joke, because when combined with their first name, Nai Shiro (ない白) means "not white" or "not Shiro".
 * Shiro's voice actor sang the first ending song, "Oración".