|Eye Color||Sky Blue|
|Magic Attribute(s)||《Binding Attribute》 Lightning|
|Magic||Lightning Fang | Thunder Formation Vacuum Attack | Thunderclap Inversion | Silver Lightning of a Thousand Ends|
|Title(s)||Friend of Lightning | Kidnapped | My Angel | Cutie Flower | Girl of Tolerance | Earnest Child | Bothersome One | Good at Getting By | Veiled Girl | Little Girl | A Changing Maiden | Shocking Lolita | Blade of the Wild | Monster Slayer | Killer of the Unique | One Who Endured Hell|
|Accessory||Bracelet of Lightning|
|Debut||Konjiki no Wordmaster Volume 1|
She is a 12 year old girl. With silver hair that reached till her waist, she wears a woolen hat that conceals her hair. Her big eyes have clear sky-blue pupils.
She has vowed to get stronger. But she is unable to believe in herself. She spent her days doubting whether or not she will even be able to influence her own life. To her, fighting is scary and being protected makes her feel relieved. But still, there are people she believes in.
Whether it was good times or bad times, Muir is still honest with herself. She is trying to be true to herself. She has the will to be honest with herself.
- Okamura Hiiro: Muir took a liking to Hiiro, and, in her eyes, he became like an older brother to her. She soon developed feelings for Hiiro, something she's not totally conscious of. She gets upset when other girls display affection towards Hiiro, showing a jealous side.
Muir has awakened to her Binding, by exchanging a contract with the Spirit of Thunder.
In order to train her to the level of holding her own as an adventurer, Muir, alongside Arnold, are to train for six months under Rarashik. Fortunately her level is already decent, so she is to learn basic combat training, Binding, and practical techniques.
Muir’s silver-grey ears start to glow with a silver light, transforming from ears that would be considered normal to a shape that resembles wings. The size of the ears has also double when compared to the original.
Muir gathers light at the base of her feet. In that moment, her ears flutters as if they are wings. From her current position, as if she were a spring, she kicks at the ground.