|Age||Late Teens (Estimated)|
|Occupation||High school student|
|Anime debut||Episode 8|
|Manga debut||Chapter 18|
|English Voice||Blake Shepard|
|Live Action||Masahiro Higashide|
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 consists of a white shirt and a blue blazer, while in the manga he wears a white shirt with black suit pants.
When he made his first appearance, Hideo revealed himself to be a relatively peaceful Parasite. After being confronted by Shinichi and Migi, he claimed he had no intention of harming Shinichi or anyone in his school and was more interested in getting to know the two of them.
Despite this, it was revealed that Hideo held no qualms with brutalizing or even killing bullies who tried to start fights with him and continued to hunt humans despite his claims to Shinichi that he was learning to eat normal food instead.
He is an active sports player, and states that it helps him get better at controlling his human host body.
Hideo is first seen having a conversation with Reiko while feeding on a body. She asks him his body's age, then requests he observe and gather data on a boy named Shinichi Izumi. When he asks the point of all this, she replies that it's 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.
Kana Kimishima, following her parasite sense, comes up behind Hideo and mistakes him for Shinichi. This gets his attention and he begins to question her, asking why she thought he was Shinichi when they have little physical resemblance. Shinichi comes across them with Kana trying to escape Hideo's grip, and threatens that if anything happens to the people around them on in their school he will kill Hideo.
After another confrontation with Kana which Mitsuo witnesses and tries to intervene in, Hideo beats up Mitsuo in a bathroom and threatens to kill him next time. Mitsuo is later asked what happened by Yano, and their gang goes to teach Hideo a lesson. He brings them to a quiet area where he could presumably kill them all without witnesses, but Migi detects his readiness to kill and warns Shinichi, who leaps over a high wall to stop them and inadvertently reveals his superhuman ability to Hideo. Upon being confronted, Hideo allows Shinichi to take care of the gang and leaves.
Yuko Tachikawa gets a crush on him, then starts stalking him and one day discovers him morphing his face to entice humans, later confronting him alone. When he tries to attack her she throws paint thinner into his open head cavity and causes him to go out of control. Unable to change his head back to normal and stuck in attack mode, Hideo rampages through the school, murdering 17 people. Several policemen attempt to stop him by shooting him, but he is unaffected by the bullets and continues onward. He is 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 bullet rounds to the body and killing dozens of students and police officers. It wasn't until Shinichi threw a rock, roughly the size of a softball, with incredible force through Hideo's chest to destroy his heart that he was stopped.
Hideo was aware of humans and their attractions towards each other, using his knowledge to shape his face to looks that would easily entice women into following him.
- The name Hideo means "excellence" (秀) (hide) and "male, greatness" (雄) (o).
- Hideo's surname Shimada means "island" (島) (shima) and "rice field" (田) (da).
- He is implied to have been working with Takeshi Hirokawa's group before his death.
- In the live action movie, Hideo's death was roughly similar but Migi turns into a bow and shoots an arrow through Hideo's chest.