Create a sleek, stealthy robotic ninja assassin in a futuristic suit. The ninja's body is equipped with high-tech robotic enhancements, including glowing energy lines and flexible, dark armor. His mask is equipped with advanced optics, making him appear otherworldly. The ninja’s stealth is enhanced by his quiet, fluid movements and the sharp katana he wields. The character should feel poised for action, exuding menace and mystery in a high-tech, shadowy world.