Hideo Shimada (島田 秀雄, lit. Shimada Hideo) is a Parasite with a teenager's body who decides to integrate with human society.
In the manga, Hideo is a young man of slightly above average height, with wide set shoulders and a generally sturdy build. He has heavily pointed eyes, with wide, flat eyebrows. His hair is neck length and black, with two short bangs at the sides of his forehead.
In the anime, he is slightly smaller, with a lankier build. He had brown hair and light brown eyes. He has a pointed fringe, which spikes down in the middle of his forehead. He wears the same school-uniform as Shinichi, which consist of a white shirt and a blue blazer, while in the manga he wears a white shirt with black suit pants.
Although Hideo is a relatively peaceful Parasite, he has no qualms about brutalizing or even killing bullies who try to start fights with him, and he continues to hunt humans (although he claims that he is learning to eat normal food instead).
Hideo is first seen having a conversation with Reiko, while feeding on a body. She asks him his body's age, telling him to observe and gather data on a boy named Shinichi Izumi. When he asks the point of all this, she replies that its for the greater good of their species.
Hideo then enrolls in Shinichi's high school and expresses a desire to become friends with Shinichi, who does not trust him. Yuko Tachikawa who gets a crush on him, then starts stalking him and one day, she managed to discovers his true identity, throwing alcohol into his open head cavity and causing him to go out of control, leading a killing spree. He was eventually killed by Shinichi and Migi on the roof of their school via a rock through the chest, which destroyed the heart.
Abilities & Powers
As a parasite, Hideo has the basic abilities to shapeshift his head, and maximize the physical potential of the body he's controlling. He can harden his cells for offensive and defensive purposes. During the massacre at the school, Hideo displayed incredible resilience and durability, taking multiple rounds to the body and killing dozens of students and police officers. It's wasn't until Shinichi threw a rock, roughly the size of a softball, with incredible force through Hideo's chest that he was stopped.
Hideo was aware of humans and their attractions towards each other, he used this knowledge and often shaped his face to looks that would easily allow him to entice woman into following him.