Marcia Asano, a Japanese national working for Bayside City's private security force Angel Arms Company, possesses blonde hair and cyan eyes. As part of Angel Arms' tactical team, she pilots a unique golden Landmate combat suit on security operations.

She excels at marksmanship in training simulations, consistently earning high scores. This skill, however, fails to translate to live combat. During actual missions, she struggles profoundly to use her firearm against hostile targets, hesitating even when facing immediate threats from advanced adversaries like cyborgs.

Her inability to employ weapons in active combat leaves operational gaps. This endangers her own safety and compromises the security of her teammates during high-risk protection assignments. The stark contrast between her simulated performance and real-world effectiveness fuels significant personal uncertainty about her capabilities and value to the unit. These doubts result in persistent self-criticism regarding her professional qualifications and combat readiness.