Sonozaki Shion

The twin sister of Sonozaki Mion.

Like her older sister, she has a crafty personality and may be even more adept at worldly affairs than Mion.

She has a soft spot for Satoshi and wanted to help him out, so she took the job of manager of the Hinamizawa Fighters.

She usually lives in Okinomiya and doesn't go to and from the village often.

Shion was actually born the older sister. On the day she was supposed to get her demon tattoo signifying her status as the family successor, the twins switched. Thus, the younger sister received the tattoo and was forced to become Mion while the older sister started to live as Shion.

As the perceived younger twin, Shion was eventually sent to the boarding school St. Lucia, remaining there for years before getting tired of it and escaping with the help of Kasai Tatsuyoshi in 1982 to live in Okinomiya.