Сонодзакі Шіон

Shion is Mion's identical twin sister, who currently resides in Okinomiya. In spite of their different personalities, she and Mion often switch places, and it can be difficult to distinguish between them.

Their first switch took place when they were little. Right before tattooing the symbol of an oni, which is reserved for the older sister, she was mistakenly identified as Shion, the younger sister, which means that she was actually born as Mion Sonozaki, the older sister. Since then, she switched her identity of Mion with Shion, the younger sister.

She was sent by the Sonozaki family to a private boarding school, but escaped and returned to live near her hometown, where she lives with Kasai. In spite of all this, she and Mion maintain a close relationship. In most of the arcs, she is at a different school from the other main characters, and therefore appears less frequently. She works as a waitress at the Angel-Mort restaurant and is the manager's assistant for the Hinamizawa Fighters little league team. She is often seen carrying a taser, and also wears yellow ribbon in her hair. She is also shown to be good with guns, along with Kasai, in Matsuribayashi-hen.