
No one but the twins themselves seemed to be aware of this. Mion and Shion intentionally switched places when they were young because "Shion," the current Mion, felt it was unfair for only one of them to attend family meetings while the other had fun. They switched places the day the oni tattoo was to be applied, resulting in the younger sister, "Shion," the current Mion, becoming the next heir. Mion is actually the younger twin, and she was therefore born with the name Shion. Her name also contains mi (魅), a kind of forest demon or elf. It is very often strongly hinted and ultimately revealed that she has a crush on Maebara Keiichi, which she expresses by picking on and teasing him at every possible occasion as well as confessing her feelings to her twin sister.ĭue to being the oldest child and thus the heir, Mion was branded with the oni (鬼) – "ogre" or "demon" – tattoo presumably on her back.

She is a tomboy, and since she is the oldest among the rest of the students, she refers to herself as " oji-san (叔父さん)" – "old man ( literally "uncle" but used generically)" – throughout the games, manga, and anime, though she also has a girly side.

The 50,000 yen announced as the winning prize at a game tournament is said to come from her own pocket. Since the Sonozaki family is quite rich, Mion has a large allowance. Because her mother, Sonozaki Akane, married a man from outside Hinamizawa against Oryō's wishes, Oryō passed her inheritance to Mion rather than Akane. She is the granddaughter of Sonozaki Oryō, the current Sonozaki head. As the oldest in the class, she is the Class Representative. Mion is the heir of the Sonozaki family and is the leader of the Hinamizawa School club.

The new anime-only arc Sato kowashi-hen, which takes place in June of 1984, confirms that she has entered her first year of high school which makes her 15 in 1984. Her and her sister's age are implied to be 14 in most media (or around 17 in the live-action adaptations) as of June 1983, since she is in her final year at the Hinamizawa school but has not yet had her birthday that year. Mion is the more well-known sister of the Sonozaki twins, as well as the more mature, stable, and tomboyish one. Sonozaki Mion (園崎 魅音) is one of the main characters in the Higurashi no Naku Koro ni series, Sonozaki Shion's twin sister, and the heir of the Sonozaki house. AK-47 Assault Rifle (used in Batsu koishi-hen).
