Hotaro is the main protagonist of the show, a 17-year-old high schooler who is yet to find his purpose in the world, but is constantly lively and friendly. However, after he is suddenly given a belt with a huge destiny behind it alongside the title of "Kamen Rider" and pushed into the world of alchemy, Hotaro is even more confused by this new world around him, but aims to maintain his lively spirit regardless of his hardships and tried his best to be a caring friend, being calmer when needed. He's also just being saying "Gotcha" at any given moment. No-one knows why.