Arue

Megumin, a classmate of Yunyun. She is a friend of Megumin, who claims to be "the most developed of the Crimson Demons". Her hairstyle is a short vertical roll with a bat wing-shaped hairpin. She seems to care about fashion, always wearing an eyepatch. She has a laid-back and straightforward personality, and her grades at school were excellent, following the two. She was invited to Megumin's farewell party and gave her an eyepatch that "seals powerful magic" as a farewell gift.

She aspires to be a writer and is currently writing "The Legend of the Crimson Demon Heroes". She sends her works to Yunyun by letter. Like all Crimson Demons, she likes dramatic behavior and developments, and in her case, she has high acting skills.

Due to misunderstandings caused by letters sent by Arue and the fact that Kazuma tore up a novel written by Arue, she has a strained relationship with Kazuma.

The introductory article of each volume, "Eternal Guide to the Village of the Crimson Demons", is said to have been written by her.