Yuen Usui is a fictional character from the anime series Neon Genesis Evangelion. As a member of NERV, Yuen plays a critical role in the organization tasked with defending Earth from mysterious beings known as Angels. Although not a primary pilot of the Evangelion units, Yuen's technical expertise and strategic mindset make him an invaluable asset to the team. Balancing the challenges of his responsibilities and personal life, Yuen often acts as a bridge between the pilots and the higher-ups, highlighting the human element amidst the chaos of battle.