Mion Sonozaki

Mion Sonozaki (園崎 魅音) is a member of the Sonozaki family and leader of the club. Mion is the successor of the Sonozaki family and acts as Oryou Sonozaki's right hand.

Background
Mion was born as "Shion Sonozaki", however due to the twins switching their names to trick adults when the twins were young, she was accidentally branded with the dragon tattoo instead of her sister and was made to adopt the name "Mion" instead. As "Mion" Sonozaki, she is next in line to take over the Sonozaki family.

Mion is the oldest student in the Hinamizawa school and acting class president. She acts like a tomboy but has a girlish side that she prefers to hide. She also organizes most of the games that the club plays

Appearance
Mion appears as a pretty young girl with green hair, often tied into a ponytail. She typically wears white shirt, beige vest with a red tie and a long red skirt. She bears a tattoo of a demon on her lower back. In her original sprite, Mion carried around a airsoft gun in a holster on her left shoulder.

When working at Angel Mort, Mion wears a costume containing a mix of several fetish outfits. She wears a seifuku top with bloomer bottoms along with a cat tail and bell.

Onikakushi-hen
Mion serves as a major antagonist in Onikakushi-hen and ends up being bludgeoned to death along with Rena Ryuuguu by Keiichi Maebara.

Watanagashi-hen
Mion serves as the primary antagonist of Watanagashi-hen and successfully kills Rika Furude, Kiichirou Kimiyoshi, and Oryou Sonozaki and ultimately dies by falling down a well. She frequently disguises herself as Shion, leading to confusion as to how Keiichi ends up stabbed and how Shion dies.

Tatarigoroshi-hen
Mion appears as a relatively minor character in Tatarigoroshi-hen and frequently serves as a source of information for Keiichi Maebara about Satoshi Houjou. Mion becomes hysterical for a short while when Keiichi asks her to take Satoko to the Watanagashi Festival, the same request that Satoshi had made of her a year prior.

Himatsubushi-hen
Mion appears only once in Himatsubushi-hen, as a mediator for Oryou Sonozaki during a flashback to a village meeting.

Meakashi-hen
Mion plays a major role in Meakashi-hen as the twin sister of the main antagonist. Mion ends up a victim of her sister's psychosis and is locked in a cage and made to watch as Shion kills of Mion's friends throughout the story. Mion ends up being murdered by and having her name tarnished by her sister.

Trivia

 * Mion's birthdate is July 10, 1966.
 * The "on' in Mion's name is written with the character "音" meaning "sound". The same character is in Shion's name as well as every servant who worked at the Fukuin House like Shannon and Kanon.