Mion
Mion is the oldest kid in Keiichi's class. As the elder, she is the class president and everyone looks up to her as the leader. Her social skills are on par with Keiichi, whom she highly respects as a friend and rival (though it is later shown that she has a crush on him). She acts like a tomboy, and calls herself oji-san (meaning old man), but has a hidden girlish side. She is next in line to be the head of the Sonozaki household, one of the Three Families which holds tremendous influence in Hinamizawa. She is often seen with a holstered airsoft gun, even though she is never seen using it, and was removed in the PS2 adaption of the game; she is, however, very adept in the use of martial arts. She is notable as the only character that has never been driven to the extreme paranoia (on screen) that causes the others to kill in the question arcs and the first two answer arcs. TIPS in other games reveal however that she was driven to kill as a result of jealousy over the attention Keiichi was getting from the others, and as a result decided to eliminate the "competition" and keep Keiichi for herself.[citation needed] Her real name is actually Shion, as she was born second to the family, but due to sister swapping even at a young age, she was mistakenly taken as Mion and branded with the oni tattoo, ultimately causing her stay as Mion.
Shion
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. She was in love with Satoshi, and blames the Three Families of Hinamizawa for his disappearance in Watanagashi-hen and Meakashi-hen (the latter told from her point of view); this, along with a different demonic sadistic personality she manifested in her grief, drove her to mass murder. One of the last words that they exchanged before he disappeared was a promise to take care of Satoko. In Watanagashi-hen and, more explicitly, Meakashi-hen, her resentment toward Satoko for her role in his disappearance causes her to forget this promise and murder her, only to remember too late; however, in subsequent arcs, she has taken the promise to heart to the point were she is willing to give up her life for Satoko. 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.
