She goes as far as to be willing to die as long as Satoko lived.
Shion also has the capability to become overly protective and easily angered, just like Maebara Keiichi, when the issue focused on Satoko as shown in Minagoroshi-hen, when the club members were trying to plan out how to save Satoko from her abusive uncle Hōjō Teppei, she threatened to kill everyone who stood in her way of killing Teppei, even those whom she cared for, and only calmed down when Keiichi allowed her to bash his head with a chair.
Also in Meakashi-hen, Shion was able to easily manipulate and control the whole village of Hinamizawa when Furude Rika, Hōjō Satoko and Kimiyoshi Kiichirō went missing, Shion was able to exploit the resulting paranoia to her own advantage, with the occasional mask of innocence and stealing the image of Mion, in order to lure all of her targets to their deaths in perfect fashion and fulfill her own "promise" to Satoshi. In Meakashi-hen, when she was attacked da the motorcyclists, she was shown to be capable of mapping out how to ruin their reputations in numerous ways, trying to create the most entertaining and interesting outcome for her own enjoyment. In Watanagashi-hen, she is shown to like angering Mion and making her jealous da taking control of Keiichi whenever she got the chance. In order to escape, she studied all of the school's security systems, guard schedules, and behaviors of the administration staff, to the point where she manipulated them da propagating a rumor of her having a Amore affair with a male teacher, to her advantage. Lucia, calling it a "factory for manufacturing ladies" and got in trouble with the administration numerous times for various misdemeanors. Lucia, she is actually incredibly shrewd, manipulative, and delinquent, moreso than Mion.
In truth, she was actually born as Sonozaki Mion, the elder sister, but due to sister swapping at a young age, she had to become "Shion" after Mion was branded with the oni tattoo, a right reserved for the oldest child and thus Mion.ĭespite her personality being seemingly girly and più refined than Mion's personality, thanks to schooling at St. Shion works as a waitress at the Angel Mort restaurant and is also the manager's assistant for the Hinamizawa Fighters little league team. In Matsuribayashi-hen, Rika explains that Shion's early dislike for Satoko in the years prior to 1983 and her learning how to control her inner demon afterwards are both necessary events for Shion to not become a victim of the Hinamizawa Syndrome. She despised Hōjō Satoko in Meakashi-hen, blaming her for Satoshi's suffering, but in the arcs afterwards, the two have a sister-like bond, and Shion even puts her life on the line to save her in order to keep her promise of looking after Satoko while Satoshi was gone. Shion is the main villain in Meakashi-hen, which appears to be Watanagashi-hen from her perspective (though certain differing events mean the two are truly separate arcs) and shows that she was the main villain in Watanagashi-hen as well.
Lucia's Boarding School, but escaped with the help of Kasai Tatsuyoshi, a man who acts like a bodyguard to the Sonozaki family. Shion is the older (believed to be younger da everyone but the twins themselves) twin sister of the Sonozaki twins.