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

Kōji Oki when Tatsuhito Ikoma calls him popular, in Tatsuhiko Ikoma.[1]

Kōji Oki (()() (こう)() Oki Kōji?) is a B-rank Sniper and a member of Ikoma Unit.


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,[7] with an ornamental button right above the tip.[8] 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;[9] 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.[7] 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,[8] gray-brown boots that reach halfway up Oki's calves,[7] and a vermillion sun visor.


Oki is easygoing and confident. He has a tendency to act in a flirtatious manner with younger girls, complimenting them while saying that he would like them to be his sisters.[9][10] He denies his popularity with girls[1] and is very secretive about that aspect of his life.[11] Nonetheless, he contested Tōma's statement that he was slow to shoot at Chika in round six because she seemed to be going for a mutual hit, claiming that she was too cute for him to pull the trigger.[9] This and similar protests are widely considered part of a "good guy" façade,[12][9] and he is in fact willing to shoot,[13][14][15] although it is possible that he finds sniping younger girls more distasteful than any other target.[16]


Tatsuhito IkomaEdit

Ikoma and Oki appear to be on friendly terms. The Sniper is amused by his captain's puzzling anecdotes and makes light-hearted remarks on them,[17][18] or, more precisely, on Ikoma's choice of subject[19] and storytelling habits.[20][21] Ikoma often comments on Oki's popularity with girls despite the latter's denial,[1] even using his good looks as an argument to get him to shoot Chika, to Oki's embarrassment. There might be a shade of envy to his teasing.[22] Ikoma believes his professed reluctance to snipe young girls to be no more than an act to support his "good guy" façade.[12] He addresses Oki by his surname, without honorifics,[23] while the Sniper uses his nickname followed by the honorific -san.[17]

Satoshi MizukamiEdit

Mizukami is not enthused by Ikoma and Oki's back and forth about the latter's popularity,[1] although he will exploit it to spur Oki into action during rank battles.[22] In fact, during a match Mizukami can often be heard egging the Sniper on.[22][24][16][25] He most commonly addresses him by his surname without appending a honorific.[13][16][25]

Maori HosoiEdit

Oki appears to like teasing Hosoi, pointing out to his teammates that she seemed to resent Ikoma never calling her cute, as when she thinks to herself that Ikoma never called her cute, sparking a round of compliments that embarrassed her greatly. He addresses her by her nickname "Mario" without honorifics.[19]

Kai MinamisawaEdit

Oki frequently dismisses Minamisawa's bursts of exuberance, which the Attacker does not appear to take to heart.[26] Oki addresses him by his first name, without adding honorifics.[27]

Isami TōmaEdit

Tōma and Oki appear to know each other well, and are close enough for Tōma to mock Oki without the latter taking offense.[28] On one such occasion Oki attempted to convince him that his delay in firing back at Chika was due to sentimentality, although Tōma was not persuaded in the least.[9] They address each other by surname, with Oki appending the honorific -san.[28]

Yuzuru EmaEdit

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.[9]

Akane HiuraEdit

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.[29]

Chika AmatoriEdit

Oki praises Chika's diligence as a Sniper and resented being assigned to taking her out in round six.[12] He claims that he had trouble pulling the trigger at the deciding moment because he always wanted a sister like her, and because cute girls are difficult to shoot at. However, she was distressed by his flirting.[9] Oki addresses her by surname, to which he appends the diminutive suffix -chan.[28]


  • (To his teammates) "Mario's got a 'He's never said that about me before' look on her face."[19]
  • (To Satoshi Mizukami) "Roger! I'll go savage and shoot her."[13]
  • (When Tatsuhito Ikoma calls him popular) "No, no, no! I ain't popular at all. For real."[1]
  • (To his teammates) "I saw her for a sec. She changes position after every shot. How earnest."[12]
  • (To Tatsuhito Ikoma) "It ain't fair that I gotta fight a little girl! Pullin' the trigger ain't gonna be easy."[12]
  • (About Yūma Kuga surviving his shot) "Really? Just an arm?"[30]
  • (To Chika Amatori) "Oh, I see a kitty. And I see Amatori with the kitty."[28]
  • (To Isami Tōma) "Since I'm an only child, I always thought it'd be great to have a sister like Amatori."[9]
  • (To Akane Hiura) "Yeah, I think I'd have trouble shooting you too."[10]


  • "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 Kansai dialect.
  • He likes akashiyaki (egg dumplings), oden, cats, and shopping,[31] and he recently took up table tennis as a hobby.[11]
  • His cat is listed among his family members.[32]
  • "Okki", Ōji's a nickname for Oki, is homophonous with the Italian word for "eyes" ("occhi").
    • The connection is strengthened by his icon, an Eye of Horus 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.
  • According to the author, who referred to him as "Mr. Visor", Oki is being watched by his teammates for a possible secret girlfriend since there are times when he is unavailable during his days off. Rumors have spread such as "he was walking with a woman wearing a mask", "he's capable of listening to different girls talking to him at the same time", or "he was running after a girl in red at breakneck speed".[11]


  1. 1.0 1.1 1.2 1.3 1.4 World Trigger Manga Chapter 153 (p. 10)
  2. World Trigger Manga Chapter 150 (p. 7)
  3. World Trigger Manga Chapter 151 (p. 1)
  4. World Trigger Manga Chapter 156 (p. 2)
  5. World Trigger Manga Chapter 190 (p. 17)
  6. World Trigger Manga Chapter 186 (p. 11-12)
  7. 7.0 7.1 7.2 Chapter 190 Color Cover
  8. 8.0 8.1 World Trigger Manga Chapter 153 (p. 1)
  9. 9.0 9.1 9.2 9.3 9.4 9.5 9.6 9.7 World Trigger Manga Chapter 163 (p. 5)
  10. 10.0 10.1 World Trigger Manga Chapter 163 (p. 6)
  11. 11.0 11.1 11.2 Volume 18 Character Profiles
  12. 12.0 12.1 12.2 12.3 12.4 World Trigger Manga Chapter 154 (p. 16)
  13. 13.0 13.1 13.2 World Trigger Manga Chapter 150 (p. 15)
  14. World Trigger Manga Chapter 156 (p. 16-17)
  15. World Trigger Manga Chapter 158 (p. 4-5)
  16. 16.0 16.1 16.2 World Trigger Manga Chapter 156 (p. 16)
  17. 17.0 17.1 World Trigger Manga Chapter 151 (p. 4)
  18. World Trigger Manga Chapter 184 (p. 18)
  19. 19.0 19.1 19.2 World Trigger Manga Chapter 150 (p. 14)
  20. World Trigger Manga Chapter 184 (p. 19)
  21. World Trigger Manga Chapter 187 (p. 3)
  22. 22.0 22.1 22.2 World Trigger Manga Chapter 154 (p. 17)
  23. World Trigger Manga Chapter 155 (p. 18)
  24. World Trigger Manga Chapter 155 (p. 3)
  25. 25.0 25.1 World Trigger Manga Chapter 186 (p. 6)
  26. World Trigger Manga Chapter 152 (p. 12)
  27. World Trigger Manga Chapter 185 (p. 6)
  28. 28.0 28.1 28.2 28.3 World Trigger Manga Chapter 163 (p. 4)
  29. World Trigger Manga Chapter 163 (p. 5-6)
  30. World Trigger Manga Chapter 155 (p. 17)
  31. World Trigger Manga Volume 17 (p. 130)
  32. World Trigger MangaBorder Briefing File (p. 118)


e d vBorder
Commander in Chief Masamune Kido
Administration Eizō NetsukiKatsumi KarasawaKyōko SawamuraMasafumi ShinodaMotokichi KinutaTakumi Rindō
General Staff Mikhael CroninRaizō TerashimaSeiji MizunumaYuri Rindō
S-Rank Tsukihiko Amō
A-Rank Ai KitoraAsumi AmakuraFutaba KuroeHayato UnoIsami TōmaJun ArashiyamaKei TachikawaKen SatoriKirie KonamiKyōsuke KarasumaKōhei IzumiMai KitagawaMitsuru TokiedaNozomi KakoReiji KizakiRyō UtagawaRyūji SaekiSaki KusakabeShinji FuyushimaShirō KikuchiharaShūji MiwaShun MidorikawaShōhei KoderaSōya KazamaTakaaki KatagiriTakeru YuigaTōichirō MomozonoTōru NarasakaYōsuke YoneyaYūichi JinYukimaru Ichijō
B-Rank Akane HiuraAtsushi HokariChika AmatoriDaichi TsutsumiFumika TeruyaHaruaki AzumaHiro KitazoeHisato SasamoriHyuseItsuki FujisawaKō MurakamiKōtarō SuwaKotarō TomoeKuniharu KakizakiMakoto ChanoMasataka NinomiyaMasato KageuraNoboru KoaraiOsamu MikumoRei NasuRokurō WakamuraShinnosuke TsujiSumiharu InukaiTaichi BetsuyakuTakuma YubaTatsuhito IkomaTatsuya KurumaTetsuji ArafuneTsuneyuki OkuderaYūko KumagaiYūma KugaYūta MiuraYuzuru EmaYōko KatoriYoshito Hanzaki
C-Rank Fumifumi SaotomeHidehide HinoeIzuho NatsumeTeruteru Kōda
Operators Aki HiyamiAn KobayakawaAoi KusumotoAsuka AsagiriHana SomeiHaruka AyatsujiHikari NireKaho MikamiKarin YuitsukaMadoka UiMako HitomiMegumi TokuraRen TsukimiRin KagamiRisa MakiRui OsanoSaki KusakabeSakurako TaketomiSayoko ShikiShiori UsamiYuu KunichikaYuka Kon
Former Border Agents Mirai HatoharaShin KazamaSōichi MogamiYūgo Kuga
Affiliated Personel RaijinmaruReplicaRinji AmatoriYōtarō Rindō
Units Arafune UnitArashiyama UnitAzuma UnitChano UnitEbina UnitFuyushima UnitHayakawa UnitIkoma UnitKageura UnitKakizaki UnitKako UnitKatagiri UnitKatori UnitKazama UnitKizaki UnitKuruma UnitKusakabe UnitKōda UnitMamiya UnitMatsushiro UnitMikumo UnitMiwa UnitNasu UnitNinomiya UnitŌji UnitSuwa UnitTachikawa UnitTokiwa UnitUrushima UnitYoshizato UnitYuba Unit
Branches Hayanuma BranchHisama BranchSuzunari BranchTamakoma BranchWataayu BranchYumite District Branch
Factions Kido Faction • Shinoda Faction • Tamakoma Branch
Triggers AsteroidBagworm • Bagworm Tag • Bail OutChameleonConnectorDummy BeaconEagletEscudoFūjinFull ArmsFull AttackGeistGimletGrasshopperHoundIbisIdatenKogetsu(Spear/Gen'yō/Senkū) • Lead BulletLightning • Makō • MeteorRadarRaygust (Shield/Thruster) • RingScorpionShield (Anchor Mode/Full Guard) • SpiderStarmakerSwitchboxTeleporterTomahawkTrion bodyViper

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