Nina attends Seika School for Girls as a student and belongs to a detective group composed of five wealthy girls. Born in New York City, she descends from a legendary Russian lineage. Nina exhibits a strong affinity for military matters and demonstrates exceptional proficiency with firearms, acting as the group's primary marksman. Her expertise encompasses effectively handling various types of guns.

Physically, Nina possesses yellow or blonde hair and stands 173 cm tall. She maintains a weight of 52 kg with body measurements of 90-60-92 cm and has blood type A.

Within the group, Nina leverages her specialized combat skills during confrontations, particularly against hostile forces like mercenaries targeting the detectives. Her background and training enable her to engage adversaries using firearms.