Un (吽) is a member of the group Tsurezure Naru Ayatsuri Mugenan as well as the band's bassist. She also sings in the anime.
She was born and raised in a music instrument craftsmen family from the far eastern world and is childhood friends with A.
A tan mouse who wears a brown hat and a dull navy-grey robe with light grey accent. On her feet are red and white toe-sandals.
In Flame Mode her robe colors brighten and she gains a pink bead necklace. In Hellfire, her hat darkens, as does her attire. She gains white socks and an orange cloth hanging over her torso.
In Hoakari no Mikoto form, her hat gains a design to it and the shine of an eye is visible from the slots. Her robe turns grey, silver, and dark raspberry in color. On her wrist is a bracelet.
In the anime, Un's design gained several changes. She loses the hat to reveal her mouse ears and tail are dark grey, while her skin is pale cream in color and her nose brown. She has big blue eyes and rose-pink hair pulled into pigtails held with blue ribbons that have a white dot pattern, along with a single flower hair clip. On her tail is a pink and white bow. Her robe is changed to appear more stylized and feminine, being white with pale pink with a floral design to match the sleeves and leg warmers included. Each part of the outfit is lined with cherry ribbons, while around her stomach is a black floral ribbon and sticking out from beneath the skirt is a grey pleat petticoat. On each wrist is a grey wrist strap, while she wears grey and gold sandals with red toe straps.
She has a simply personality but her hands are really skillful and she handles the maintenance of music instruments well.
- In some variations of her human form, the bows she wears lack their dots.
- Sings with A in the song "掻き鳴らせよ旋律".