Engine Bros is a fictional character group from Kamen Rider Build rather than a single named individual. They are antagonistic riders associated with the series’ conflict-driven battles and serve as part of the larger enemy forces encountered by the protagonists. Their presence helps raise the stakes in the story by providing a distinctive armored opponent tied to the show’s transformation and combat themes. The name is commonly rendered as a single unit, and there is no widely established separate personal first and last name.