Dr. Ratio Arashi is a pivotal character in the popular anime series 'Honkai: Star Rail.' As an enigmatic scientist specializing in Honkai energy, Ratio plays a dual role as both a guide and a potential adversary to the protagonists. His vast knowledge and expertise in Honkai technology make him a valuable asset, though his true intentions often remain shrouded in mystery. His calm demeanor and analytical mind are contrasted by occasional glimpses of a more personal, vulnerable side, which deepens his intricate character portrayal and leaves viewers questioning his ultimate allegiance.