Synecdoche is a Japanese manga artist whose professional career is primarily defined by the creation of the series Plus-Sized Elf. The creator works under the pen name Synecdoche, written in Japanese as シネクドキ, and is also known to use the name Methonium for works in a different genre. Limited biographical details are publicly available, though it is recorded that Synecdoche's birthday is January 5.

The artist's most significant and well-known work is Plus-Sized Elf, which began serialization in December 2016 on Wani Books' Comic Gum website. The series follows Tomoatsu Naoe, a massage therapist, who helps Elfuda, an elf from another world, lose weight she gained from eating junk food on Earth, leading to a series of comedic encounters with various mythical creatures facing similar issues. The original manga ran until June 2020, and after a brief period of self-publication, a continuation titled Plus-Sized Elf: Second Helping! began in Akita Shoten's Dokodemo Young Champion magazine in October 2021. Both the original series and its sequel are licensed for English release in North America by Seven Seas Entertainment.

Beyond the flagship Plus-Sized Elf series, Synecdoche's body of work includes other manga titles. Among these are Ring Ring Tanuki and Synecdoche no Moto, both of which are one-shot works from 2015 and 2016 respectively. These earlier works, along with the main series, consistently fall within genres such as comedy, ecchi, fantasy, and slice of life, indicating a sustained artistic focus.

The creator's profile expanded with the adaptation of Plus-Sized Elf into an anime television series. Produced by the studio Elias, the anime aired from July to September 2024, bringing the story of Elfuda and her unconventional fitness journey to a broader audience. This adaptation represents a significant milestone in Synecdoche's career, elevating the creator's status from a manga author to an original creator whose work has been realized in a major multimedia format. Synecdoche is credited as the original creator for the anime, a credit that reflects the foundational role of the manga in the production.