Daruizen serves as a secondary antagonist for King Byogen, originating from the Byogen Kingdom. He is the son of Guaiwaru, with Shindoine as his older sister and Sofia as his younger sister; Nebusoku and Batetemoda are his cousins. Expanded media identifies Layla Violet as his wife. Physically, Daruizen manifests as a pale blue-skinned, devilish boy with olive eyes and dark green hair. Distinctive features include red horns and a scorpion-like tail. His gothic attire consists of a dark red coat over a dull green collared shirt, a dark brown vest with gold buttons, a black choker, black trousers, and dark brown leather boots. His Mega Form alters this appearance: the coat darkens, lengthens, and gains blue layers with dark green appendages. Horns grow longer and curve, dark crimson makeup appears, and taffy pink irregular markings manifest near his right eye. A blue rose lapel with yellow strings adorns his right chest, while his belt features a red gem. Daruizen's personality presents as calm yet emotionless, aggressive, and strategically cunning. He takes a more laid-back approach to attacking Earth than fellow generals but demonstrates greater intelligence and sadism. He holds a delusional, cynical worldview, believing efforts to save Earth are futile. His manipulative nature led him to attempt convincing Cure Grace to aid him, though she refused. A significant aspect of his background involves Nodoka Hanadera. He originated from a Dark Seed implanted by a Megabyogen, causing her prolonged childhood illness and hospitalization. After King Byogen recalled him, he later sought to re-enter Nodoka's body to recover and hide, exploiting her traumatic history. His defeat occurred when Cure Grace delivered a decisive beatdown in Episode 42. Daruizen possesses the ability to transform into a Beast Form and summon Megabyogen or Gigabyogen entities. These powers align with his role in infecting the environment to further the Byogens' goal of planetary poisoning.