Murasaki Ikoma is a SORD operative who calls herself a Russian ninja, though her actual heritage is unclear and she enjoys making outlandish claims about her ninja skills, including a supposed master ninja certification. Her true strength lies in disguise, and she is primarily assigned to stealth and infiltration missions. She favors small, concealable weapons such as small-bore automatic pistols and a kunai, and her calling card is the use of.22 caliber subsonic ammunition. She is also skilled with katana swords and rifles.

Her personality is deliberately elusive; she rarely reveals her genuine feelings and takes visible pleasure in saying strange things to confuse others. Even in summer, she wears a long scarf around her neck that appears to be a normal fashion accessory but is actually woven from aramid fiber and synthetic protein, making it both bulletproof and fire resistant.

Murasaki has known Haruto Aoi since early childhood and regards him as an older brother figure, though hints of deeper romantic feelings may exist. In close-quarters combat, she places third among the team: her ferocious speed is outmatched by Haruto's technique and Rena's raw power. Over the course of the story, her reliance on deception and evasion remains central to her role, and her bond with Haruto continues to shape her motivations, even as she maintains her playful, inscrutable front.