★Japanese Voice Actor: Kaolip
★Japanese Death Metal Voice: Rarecho
★English Voice Actor: Erica Mendez
★English Death Metal Voice: Jamison Boaz
★German Voice Actor: Julia Stoepel
★Spanish (LA) Voice Actor: Desiree González
★Spanish (EUR) Voice Actor: Vera Bosch
★French Voice Actor: Sophie Landresse
★Italian Voice Actor: Iolanda Granato
★Portuguese (BRZ) Voice Actor: Agatha Paulita
★Cantonese Voice Actor: Gu Yuxue (顾咏雪 / 顧咏雪)
Retsuko's appearance is based off of a Red Panda. She has light orange fur on her face, black eyes, white ears, brown legs and arms, and a brown and light orange striped tail. Retsuko is seen in many different outfits throughout the series, but her typical clothing consists of a peach sweater with jewels around the collar and plaid skirt with black Mary Jane shoes. During the winter, Retsuko is usually seen wearing a navy blue peacoat, black skirt, tights and boots, and a peach scarf. Her work apparel is the typical female office uniform: blue vest and skirt, white dress shirt, and black shoes.
When she starts screaming death metal, Retsuko's appearance changes to KISS-like makeup, sharper teeth, a split tongue, and is often crying and her eyes glow the color blue. While screaming death metal as well, the kanji for rage (烈) appears on her forehead.
In her office Retsuko is a soft-spoken and polite girl who works diligently often being the only person to work overtime - usually because her bosses drop their work on her desk to leave on time. But in her head, Retsuko is usually thinking down of her coworkers, internally begging them to leave her alone and daydreaming of ways to quit her job.
★Resasuke: Retsuko and Resasuke briefly dated, but broke up after Retsuko realized that Resasuke didn't really care about her the way she did for him.
★"DEATH METAL IS MY SOUL!!"
★"GET YOUR DIRTY PAWS OFF MY MONEY!!"
★"CHOKE ON MY RAGE!!"