Koutarou Nogami is a fictional character from the series Kamen Rider Den-O, who appears as Kamen Rider Gaoh, the main antagonist of the Kamen Rider Den-O: I'm Born! movie. Gaoh is a time-traveling thief who seeks to obtain the legendary GaohLiner train and use its power to control all of time. Ruthless and cunning, he poses a significant threat to the Den-O team with his ambition and formidable combat abilities.