Minus Name: Real Eater
The comic relief character of the series, the granddaughter of the Headmaster of Hakoniwa Academy. Zenkichi regards her as his best friend; he is apparently the only person who can get along with her and somewhat control her. Even though she is the smallest of the main characters, Shiranui has a very large appetite and is constantly seen eating. She has a knack for finding clandestine information with ease, knowing about most things that would seem to be vague details, and is unusually perceptive. Normally, she is a very cheerful girl but she is shown to have a dark side and is brutally tactless. Shiranui harbors a hidden resentment against Medaka and claims she has no friends and, unlike the other abnormals, does not desire them. Because of the antagonism that exists between them, Medaka initially asks Shiranui to become the Vice President of the Student Council, though Shiranui refuses.
While she prefers to remaining on the sidelines observing and is extraordinarily capable of removing herself from any danger, Shiranui elects to join Class -13 after encountering Kumagawa. With this choice decides to test her friendship with Zenkichi which reacts in an unexpected way: worrying about her safety without ever questioning their friendship. Despite her claims to not care for anyone nor having any friends, it seems that she has deep feelings for Zenkichi. Recently, her ability has been revealed as "Real-Eater." Though demonstrated, the properties of Shiranui’s Minus have yet to be explained. She is shown using it on Kuudou Hinokage, which she calls “lending” it to him. At the same time, she claims that her Minus isn’t very convenient to use. After this encounter, Hinokage has developed a new Abnormality he calls Theme Song, though how it relates to Shiranui’s Real Eater is still unknown. Her grandfather originally saw her as the base for Class -13, suggesting that she has abilities on par with those of Kumagawa, and he himself recognizes the similarites between them. She was also able to come out of attacks by both Shibuki Shibushi and Kagamaru Chougasaki unscathed.
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