Mizuki Segawa A Japanese High-school student and younger sister of Tetsuro Segawa she is polite and Soft spoken, the accountant for the Student council She is somewhat short even for a Japanese girl, very slender and wears her hair in a page-boy cut that emphasizes her eyes.Initially ignorant of the immense happenings around her, she is shocked at first and downright horrified later to learn of the true nature of the world and humanity that Humanity was created by a race called "the creators". She comes very close to a mental breakdown at the revelation that humans were originally created by aliens as biological weapons. But, just like Sho himself, she overcomes her fears, accepting reality and standing with her friends as well as she can against the Evil Organization "Chronos" and their soldier like weapons the Zoanoids. The Guyver was originally a simple space suit by the Creators but when applied to a human made over 100x stronger than normal with an array of weaponry like High frequency swords,lasers, sonic weaponry and the ability to fly. a symbiotic lifeform controlled by a "Control medal" to keep from overloading and "eating" its host Chronos" is worldwide in the government in positions of power and bases every like "Chronos Japan" planning to secretly take over the world seeing Zoanoids as the evolution of mankind the true humanity a higher species with Chronos ruling Chronos hunts Sho and later Agito because of their Guyver units they want the Guyver.