Kōji Oki

"No, no, no! I ain't popular at all. For real."

- Kōji Oki when Tatsuhito Ikoma calls him popular

Kōji Oki is a B-rank Sniper and member of Ikoma Unit.

Appearance
Oki is a light-skinned young man of average build. He has short, messy, wavy black hair parted at the center-front, and blue eyes. He has a mole below his right eye.

Oki's uniform is comprised of a vermillion, white-zipped jacket. A horizontal white line runs across the chest portion roughly at the height of his armpits, whereas on the back it bends into a flat V-shape pointing downwards, with an ornamental button right above the tip. On the right breast, the white line encircles Border's logo, above which is emblazoned the B-rank emblem. Everything above the white line is black in color, including the high collar, which Oki keeps open to reveal an undershirt with a V-neck; the only exception are the vermillion plain button epaulets. The sleeves are also black until roughly halfway through the humerus, after which they turn vermillion, and disappear into Oki's thick gloves about an inch past the elbow. The gloves are black with a gray palm and a thin brown buckle that encircles them near the cuff. The black portion of the sleeves and the collar bear a square motif that suggests padding. The uniform is completed by black pants with front and back pockets, gray-brown boots that reach halfway up Oki's calves, and a vermillion sun visor.

Personality
Oki is very obedient concerning objectives, vowing to snipe Chika with no mercy after Mizukami asks him to take care of her, thought during the actual match he says it'd make him feel bad and tries to make Ikoma take care of her instead. He becomes flustered when told that he is popular with girls and quickly denies that he is, but there are various rumors on whether he is popular or not. He seems to have a tendency to act in a flirtatious manner with girls. He has a good guy image, which annoys Ikoma, who believes it to be just an act.

Tatsuhito Ikoma
Oki has an awkward relationship with Ikoma, who believes him to be popular with girls no matter how much Oki denies it, which leaves Oki really embarrassed. Ikoma is also annoyed by Oki's "good guy act". Nonetheless, they seem to be on good terms with each other.

Maori Hosoi
Oki appears to like teasing Hosoi, as when she thinks to herself that Ikoma never called her cute, he quickly points out to the others, somehow knowing what she was thinking.

Yuzuru Ema
Ema and Oki might be on good terms with one another, since Oki addresses the younger Sniper by his first name, without honorifics. However, Ema was bothered by Oki's flirtatious behavior around Chika both because he was making her uncomfortable and out of jealousy, and told him to stop, which surprised Oki. Even on that occasion Ema addressed him respectfully, appending the honorific -senpai to his surname.

Akane Hiura
Hiura and Oki are on good terms. After she heard him say that he has trouble sniping cute girls, Hiura asks him if he would be able to shoot at her, and she rejoices when he says that he would indeed be conflicted. She addresses him by his surname followed by the honorific -senpai, while he uses her surname and the suffix -chan.

Quotes

 * (To his teammates) "Mario's got a 'He's never said that about me before' look on her face."
 * (To Satoshi Mizukami) "Roger! I'll go savage and shoot her."
 * (When Tatsuhito Ikoma calls him popular) "No, no, no! I ain't popular at all. For real."
 * (To his teammates) "I saw her for a sec. She changes position after every shot. How earnest."
 * (To Tatsuhito Ikoma) "It ain't fair that I gotta fight a little girl! Pullin' the trigger ain't gonna be easy."
 * (About Yūma Kuga surviving his shot) "Really? Just an arm?"
 * (To Chika Amatori) "Oh, I see a kitty. And I see Amatori with the kitty."
 * (To Isami Tōma) "Since I'm an only child, I always thought it'd be great to have a sister like Amatori."
 * (To Akane Hiura) "Yeah, I think I'd have trouble shooting you too."

Trivia

 * "Kōji" (孝二) is composed of 孝 (filial piety, obedience, mourning) and 二 (two), while "Oki" (隠岐) is composed of 隠 (hiding, concealment) and 岐 (high, majestic, fork in road).
 * Like the rest of his teammates (with the exception of Minamisawa), he speaks in.
 * He likes ' (egg dumplings), ', cats, and shopping, and he recently took up table tennis as a hobby.
 * His cat is listed among his family members.
 * "Okki", Ōji's nickname for Oki, is homophonous with the Italian word for "eyes" ("occhi").
 * The connection is strengthened by his icon, an with Oki's visor cap over it and a mole to the side. The Eye of Horus is an ancient Egyptian symbol of protection, royal power and good health.