|Occupation||Mayor of East Fukuyama City|
|Partner(s)|| Reiko Tamura |
|Anime debut||Episode 9|
|Manga debut||Chapter 20|
|English Voice||John Gremillion|
|Live Action||Kazuki Kitamura|
Takeshi Hirokawa (広川 剛志, lit. Hirokawa Takeshi) was the leader of a cabal of Parasites which counts Reiko and Gotō among its members. He was the Mayor of East Fukuyama City, and a human who sympathized with the Parasites.
Hirokawa was a well kept man, he had short, brown hair that neatly combed back. He had an average height and build, and was always seen with a formal suit and tie.
Hirokawa was a level-headed man, his demeanor usually was calm and kept without expression, this made people mistake him as a parasite. He believed that humans are toxic, and greatly disapproved of how the human race treats the planet and all the other species around them. Being sympathetic with parasites, he truly believed they were the answer to cleansing the planet of humans and assumed them as trash.
The group attempts to accrue political power in order to set up safehouses where they can take their victims, killing and eating them in secret. Hirokawa gains election to the office of mayor in East Fukuyama City, a small town (by Japanese standards) of 500,000 people close to Shinichi's hometown. Hirokawa wins by running on a campaign centered around locally based environmentalism. Secretly, Hirokawa is a radical environmentalist who believes that the Parasites' purpose is to cull the human population, standing one step above them on the food chain. The police force kills Hirokawa and discovers that he was never a Parasite, but a human Parasite sympathizer.