Shinichi Izumi is the protagonist of the anime series 'Kiseijuu,' also known as 'Parasyte.' He is a high school student whose right hand is infected by a parasitic alien named Migi. Unlike other parasites, Migi is unable to take over Shinichi's brain, leading to a unique coexistence between the two. Throughout the series, Shinichi struggles with maintaining his humanity while battling other parasites that threaten human lives. His character evolves from a timid teenager to a courageous and determined fighter, exploring themes of identity and survival.