Shinichi Izumi is the main character in the manga and anime series Parasyte. He is a high school student who becomes partially infected by a parasitic alien known as Migi. This unique bond allows him to gain enhanced abilities while also facing the challenges of coexisting with a creature that has its own motives. Throughout the series, Shinichi struggles with his humanity and the moral dilemmas posed by the parasitic invasion. As he battles other parasites that threaten humanity, he learns about survival, identity, and the nature of life itself, making his journey both thrilling and thought-provoking.