Marin is a tall, curvy young woman with waist-length, blonde hair that covers her back. Her bangs cover her forehead and reaches her long eyelashes. She has two locks of hair which extends over her shoulders at the front. Her hair is straight at the start of the manga but became curly later on. Her hair colour ranges from golden blonde to citrus orange. She wears a multitude of earrings on both of her ears.

She has a gyaru sense of fashion. At school, she is often seen in her highschool uniform shirt tied around the waist with rolled up sleeves, above-knee-length knife-pleated skirt and tie, along with a choker, necklace and wrist chain. Her uniform has a breast pocket on the right. Her fingernails are very long and she wears a ring on her pinky finger.