Extra Terrestrial Lifeform Evolto is the main antagonist of Kamen Rider Build. Evolto has the traits of a high-functioning sociopath, with his goal of destroying the Earth using the Pandora Box coming to light, and his tendency to betray those he comes across with. He manipulates both heroes and villains alike to further his twisted quest and he nonchalantly fooling around even when doing his job. While he is shown to have some genuine sentiment for Sento and Misora as family.