|gender = Mal |height = 170cm |weight = 54kg |occupation = Student |status = Deceased |manga = Chapter 1 |anime = Episode 1 |appein = Manga, Anime |japvoice = Hiroyuki Yoshino |engvoice = Todd Haberkorn}}
Takumi Nishijou(タクミ・ニシジョウ, Saijō Takumi) is the main protagonist of Chaos;Head. A second-year high school student that lives like a hikikomori in a metal container and spends most of his time playing games. He has an delusion of Seira Orgel most of the time.
Takumi has long, spiky blue hair and medium-sized, downward facing hazel eyes. He has a long and lankey build with pale skin, most likely the result from spending most of his time indoors. Takumi also tires frequently because of his lack of exercise.
He is usually dressed in his school uniform (a tan jacket with blue-green plaid pants), but can also be seen wearing a plain blue T-shirt and jeans.
Takumi is a shy, quiet person, and does not usually talk during school unless someone addresses him first. Takumi has an obsession with video games and the anime "Blood Tune", which many call him an "otaku" for. Takumi oftenly suffers from "delusions," which are imaginary images that appear realistic, yet never actually happen.
Most of Takumi's delusions are unpleasant or often fairly erotic, , Seira however is his most occurring (and favorite) delusion, and usually appears whenever Takumi is on his computer, or in his bedroom in general. When Rimi Sakihata (his apparent best friend) held his newest Seira-tan figurine, Takumi stated "Get your hands off my wife!" But could've also been out of fear
Because of his love of video games and anime, Takumi created a "minimal attendance chart" in order to spend more time at home. His attendance chart was the only one that was ever created at Suimei Academy, and for obvious reasons. Takumi is perhaps the only person in his school that does not care about academics, and created the chart to receive the minimal credits necessary to pass in his grade. He also has a distaste for "3-D girls", and would rather spend time with Seira than be sociable in the real world.
(needs to be edited by an otaku)