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Sodachi Oikura (老倉 育)Araragi's childhood friend. She is a student with a strong sense of competitiveness which led to her popular nickname, much to her chagrin.
Sodachi was the president of a first-year class where both Hitagi and Koyomi also belonged to. At school, she wanted to be called as "Euler," but ends up getting the nickname "How Much," a pun on her surname (お幾ら, o-ikura) and a reference to her personality.
(Source: Bakemonogatari Wikia)