Zero Alternative is a fictional character from the Kamen Rider franchise, appearing in spin-off media and expanded universe content. Known for his mysterious presence and enigmatic origins, Zero Alternative is often depicted as a rival or anti-hero to the main Kamen Rider protagonist. He possesses unique abilities and a distinctive transformation device that sets him apart from other Riders. His role in the series often revolves around challenging the protagonist’s ideals and pushing them to grow stronger through their confrontations.