Shōko Hoshi is a 15-year-old girl from Fukushima marked by profound social awkwardness and introversion, often speaking with a stutter. Her primary passion is cultivating mushrooms, engaging them in conversation. She became an idol due to external persuasion, not personal drive.

Under performance pressure or high stress, Shōko undergoes a drastic personality shift. This altered state adopts a death metal aesthetic and unrestrained demeanor, characterized by two distinct laughter patterns: a regular "fuhihi" and a metal-inspired "hyahahaha". This transformation manifests both onstage and in stressful offstage situations.

She maintains friendships and collaborative ties within several idol units:
* **individuals** with Mirei Hayasaka and Nono Morikubo
* **Under the Desk** with Nono Morikubo and Mayu Sakuma
* **142's** with Sachiko Koshimizu and Koume Shirasaka
* **Zekkenzu** with Airi Totoki, Akane Hino, Aiko Takamori, and Yuko Hori
* **NEX-US** with Yuka Nakano, Anastasia, Nao Kamiya, and Miku Maekawa
* **flamme martini** with Tsukasa Kiryu, Miyu Mifune, and Hajime Fujiwara
* **SOUL LEATHERS** with Tamami Wakiyama and Reina Koseki.