TV-Series
Description
Koji Oki is a B-rank Border Sniper and member of Ikoma Squad. Border recruited him from his hometown of Osaka. He possesses light skin, an average build, short messy wavy black hair parted center-front, blue eyes, and a distinctive mole below his right eye. His standard uniform consists of a vermillion jacket with white accents, black pants, gray-brown boots, and a reddish-orange sun visor.

Oki exhibits an easygoing and confident demeanor. He frequently flirts with younger girls, showering them with compliments and expressing a desire for them to be his sisters, citing his status as an only child. Despite this behavior, he firmly denies any popularity with girls and remains secretive about his personal romantic life. Teammates and others often perceive his claims about hesitating to shoot younger female opponents—like Chika Amatori—as part of a calculated "good guy" act. Evidence confirms he will snipe such targets when required, though he may find it more distasteful than targeting other opponents.

In combat, Oki serves as a capable Sniper for Ikoma Squad, which consistently ranks in B-rank's upper tier. His primary Triggers include Egret for precision sniping, Lightning for suppressive fire, and Grasshopper for rapid mobility across terrain, enabling quick ascents to sniper perches or evasive maneuvers. He typically hides his position with Bagworm and employs Shield for defense. During Rank Wars, he temporarily equipped Ibis to counter high-trion opponents like Hyuse, successfully using it to eliminate Sniper Kazuto Tonooka. His battle parameters show balanced capabilities, with Trion (8), Technique (8), and Evasion (7) as notable scores.

Oki participated extensively in B-Rank Wars. In Round 6, he engaged Tamakoma Second and Ōji Squad, initially hesitating to target Chika but ultimately severing her leg in a mutual hit while falling to her Lead Bullet. He later expressed regret over sniping her, reiterating his wish for a sister like her. During Round 8, he prioritized counter-sniping Tonooka after deducing the latter's threat if left unchecked, though he fell to Shinnosuke Tsuji after surviving Masataka Ninomiya's Hornet barrage. Ikoma Squad concluded the season ranked fourth with 34 points.

Outside combat, Oki enjoys akashiyaki, oden, cats, shopping, and table tennis. His cat is listed as a family member. Teammates monitor him for rumored romantic entanglements, fueled by his unavailability on certain days off and sightings with unidentified women. He speaks in Kansai dialect, consistent with most of his squad. Trivia notes his nickname "Okki" is homophonous with the Italian "occhi" (eyes), reinforced by his Eye of Horus squad icon modified with his visor and mole.