Sodachi Oikura

Sodachi Oikura, Araragi's longtime friend, is a competitive student known for her drive-a trait that earned her the moniker "How Much," playfully alluding to her surname and reflecting her determined nature. As president of their first-year class, she shared space with Araragi's other notable peers, Hitagi and Koyomi. Despite preferring to be called "Euler" due to her fascination with mathematics, this nickname stuck, highlighting the lighthearted teasing among their group.