Night Rogue is a mysterious masked villain from Kamen Rider Build, serving as one of the main antagonistic figures in the series' early and middle arcs. He acts as a high-ranking member of Faust, carrying out covert operations, experiments, and attacks while hiding his true identity. Cold, calculating, and highly dangerous, Night Rogue plays a major role in escalating the conflict around the Fullbottles and the conflict between nations, making him a key obstacle for Sento and Ryuga.