Hanyū was once known as the demon god of Onigafuchi (Hinamizawa) under her true name, Hainiryūn Ieasomūru Jieda. She travelled with her clan to the Onigafuchi Swamp and tried to coexist with the human villagers there, but the Furude priest refused to cooperate. However, Furude Riku, the heir to the Furude shrine and inventor of the nickname "Hanyū", fell in pag-ibig with Hainiryūn and married her. They had a daughter named Furude Ōka, the first in a long lines of humans to carry demon blood. When the villagers of Onigafuchi became violent towards Hainiryūn's clan and could no longer tell...

Shion is the older (believed to be younger sa pamamagitan ng everyone but the twins themselves) twin sister of the Sonozaki twins. She was sent to St. 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 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. She despised Hōjō Satoko in Meakashi-hen, blaming her for Satoshi's suffering, but in the arcs...

Rena Ryuugu

"It's so cute, I want to take it home!" - Signature quote
"Omochiikaeri~!" (I want to take it home!) - Signature quote
"Friends. Those companions you speak of are only mga kaibigan during those fun, yet unimportant times. When painful times come, they won't be your ally." - to Keiichi Maebara
"Kana? Kana?" (I wonder? I wonder?) - Signature quote
"USO DA!" (Translated as "LIAR!") - Signature quote (mainly directed to Keiichi Maebara)
"Found you, Keiichi-kun..." - to Keiichi Maebara
"Don't worry, I used the blunt end of the knife." - to Keiichi Maebara
"I’m the only one that can help you, Keiichi-kun....