Like all Crimson Magic Clan members, Arue has dark brown hair and red pupils. Her hair is shoulder-length & end as drills. Also, she is consistently described as voluptuous.
Arue uses the school uniform, consisting of a pink shirt dress, red/orange tie and a black robe, alongside black stockings, a purple bat-clip at the back of her head (in the movie she uses a hair tie) and an eyepatch identical to Megumin's.
Arue initially is described as quiet and composed and is quickly revealed to be clever, albeit mischievous. She has a penchant for storytelling, able to tell the most nonsensical statements with a completely straight face and to make her stories and Crimson Magic Clan culture semi-believable or reasonable to an outsider.
Arue is initially mentioned as the one who wrote the letter to Kazuma that he needed to marry Yunyun. It was found out later that Arue was saving some money by sending the sample page of her novel that she is working on alongside the real letter.
- Cursed Lightning: A stronger version of the lightning skill.
Advanced Magic: As a Crimson Magic Clan member, Arue has access to advanced magic in KonoSuba: Fantastic Days:
- Inferno: Creates a powerful and large burst of fire.
- Arue's birthday is on March 28th.
- Although she was always behind Megumin and Yunyun in most of the school tests, for quizzes on Crimson Magic Clan culture that required chuunibyou answers, she always exceeds the teachers' expectations and often get score marks of 100.
- She's the one who gave Megumin her eyepatch.