Marina works part-time as a waiter at the Rainy Color cafe while attending high school, sharing her shifts with colleagues Yoko Amami and Non. Her tsundere nature manifests as an initially cold or sharp exterior that softens over time to reveal genuine warmth and care. A recurring habit finds her frequently comparing her own breast size to others, often voicing dissatisfaction or insecurity about her physical appearance. She wears her hair styled in a braided ponytail.