Yuko Sagiri is a highly skilled and disciplined member of the vigilante organization known as Black Label in the anime series Triage X. As the team's sniper, she is known for her precision and calm demeanor under pressure. Yuko is characterized by her strong sense of justice and determination to eliminate criminal threats. She plays a crucial role in the team’s operations, providing cover and support for her teammates during dangerous missions. Her backstory and motivations are gradually revealed, adding depth to her character.