Coupling List Which Start with [O]
- Oayagi Hajime x Teshima Jyunta
- Oberon x Artoria Caster
- Oberon x Gudako (female protagonist)
- Oberon x Gudao (male protagonist)
- Oberon x Morgan (Fate Series)
- Ochi Tsukimitsu x Mouri Jusaburou
- Oczy x Badeni
- Oda Hiroyuki x Kanou Shuugo
- Oda Nobunaga (Drifters) x Nasu no Yoichi
- Oda Nobunaga (Drifters) x Shimazu Toyohisa
- Oda Nobunaga (Sengoku Basara) x Akechi Mitsuhide (Sengoku Basara)
- Oda Nobunaga (Sengoku Musou) x Akechi Mitsuhide (Sengoku Musou)
- Oda Nobuyuki (Geten no Hana) x Hotaru (Geten no Hana)
- Oda Sakunosuke (Bungou Stray Dogs) x Dazai Osamu (Bungou Stray Dogs)
- Oda Sakunosuke (Bungou Stray Dogs) x Sakaguchi Ango (Bungou Stray Dogs)
- Oda Sakunosuke (Bungou to Alchemist) x Kikuchi Kan (Bungou to Alchemist)
- Oda Sakunosuke (Bungou to Alchemist) x Miyoshi Tatsuji (Bungou to Alchemist)
- Oda Sakunosuke (Bungou to Alchemist) x Yokomitsu Riichi (Bungou to Alchemist)
- Odagiri (Joker Game) x Fukumoto (Joker Game)
- Odajima (Mononoke) x Medicine Seller
- Odoroki Housuke (Apollo Justice) x Naruhodou Ryuichi (Phoenix Wright)
- Oga Akita x Daimonyama Tsuranuki
- Oga Akita x Hayasugi Hayato
- Oga Akita x Tsukiyama Shinobu
- Oga Tatsumi x Furuichi Takayuki
- Ogami Shirou x Kagemori Michiru
- Ogata Hyakunosuke x Asirpa
- Ogata Hyakunosuke x Hanazawa Yuusaku
- Ogata Hyakunosuke x Kiroranke
- Ogata Hyakunosuke x Koito Otonoshin
- Ogata Hyakunosuke x Mob Character
- Ogata Hyakunosuke x Ogata Hyakunosuke
- Ogata Hyakunosuke x Reader (Female)
- Ogata Hyakunosuke x Shiraishi Yoshitake
- Ogata Hyakunosuke x Sugimoto Saichi
- Ogata Hyakunosuke x Tanigaki Genjirou
- Ogata Hyakunosuke x Tsukishima (Golden Kamuy)
- Ogata Hyakunosuke x Tsurumi (Golden Kamuy)
- Ogata Hyakunosuke x Usami (Golden Kamuy)
- Ogata Hyakunosuke x Vasily
- Ogata Seiji x Shindou Hikaru
- Ogata Seiji x Touya Akira
- Ogawa shinji x Kazanari Tsubasa
- Ogawa Yuzuriha x Ooki Taiju
- Ogma x Marth
- Ogma x Navarre
- Oguri Kouhei x Kikuchi Masayuki
- Ohama Kanemon x Hachiya Saburou
- Ohama Kanemon x Kukuchi Heisuke
- Ohama Kanemon x Takeya Hachizaemon
- Oikawa Shin x Amamiya Kanade
- Oikawa Shin x Kazama Keigo
- Oikawa Toru x Futakuchi Kenji
- Oikawa Toru x Hanamaki Takahiro
- Oikawa Toru x Hinata Shoyo
- Oikawa Toru x Hinata Syouyou
- Oikawa Toru x Iwaizumi Hajime
- Oikawa Toru x Kageyama Tobio
- Oikawa Toru x Kunimi Akira
- Oikawa Toru x Kuroo Tetsurou
- Oikawa Toru x Kyoutani Kentarou
- Oikawa Toru x Oikawa Toru
- Oikawa Toru x Reader (Female)
- Oikawa Toru x Shimizu Kiyoko
- Oikawa Toru x Sugawara Koushi
- Oikawa Toru x Tanaka Ryunosuke
- Oikawa Toru x Tsukishima Kei
- Oikawa Toru x Ushijima Wakatoshi
- Oikawa Toru x Yachi Hitoka
- Oji Mochizo x Kitashirakawa Tamako
- Ojiro Mashirao x Shinsou Hitoshi
- Ojiro Mashirao x Todoroki Shouto
- Oka Satomi x Narita Kyouji
- Okabe Rintarou x Makise Kurisu
- Okabe Rintarou x Shiina Mayuri
- Okada Izou (Fate Series) x Gudako (female protagonist)
- Okada Izou (Fate Series) x Gudao (male protagonist)
- Okada Izou (Fate Series) x Miyamoto Musashi (Fate Series)
- Okada Izou (Fate Series) x Okada Izou (Fate Series)
- Okada Izou (Fate Series) x Sakamoto Ryouma (Fate Series)
- Okada Izou (Fate Series) x Tanaka Shinbei (Fate Series)
- Okamura Kenichi x Fukui Kensuke
- Okazaki Kei x Hoshino Ichika
- Okazaki Tomoya x Sunohara Youhei
- Oki Kouji x Ikoma Tatsuhito
- Oki Kouji x Mizukami Satoshi
- Okino Tsukasa x Hijiyama Takatoshi
- Okita Sougo x Hijikata Toushirou
- Okita Sougo x Kagura
- Okita Sougo x Katsura Kotarou
- Okita Sougo x Kondou Isao
- Okita Sougo x Sakata Gintoki
- Okita Sougo x Shimura Shinpachi
- Okita Sougo x Yamazaki Sagaru
- Okita Souji (Bakumatsu Rock) x Hijikata Toshizou (Bakumatsu Rock)
- Okita Souji (Bakumatsu Rock) x Sakamoto Ryouma (Bakumatsu Rock)
- Okita Souji (Bakumatsu Rock) x Takasugi Shinsaku (Bakumatsu Rock)
- Okita Souji (Fate Series) x Oda Nobunaga (Fate Series)
- Okita Souji (Fate Series) x Saitou Hajime (Fate Series)
- Okiya Subaru x Akai Shuichi
- Okiya Subaru x Amuro Tooru
- Okiya Subaru x Edogawa Conan
- Okiya Subaru x Haibara Ai
- Okiya Subaru x Kudou Shinichi
- Okiya Subaru x Reader (Female)
- Okkotsu Yuuta x Gojou Satoru
- Okkotsu Yuuta x Inumaki Toge
- Okkotsu Yuuta x Itadori Yuuji
- Okkotsu Yuuta x Orimoto Rika
- Okkotsu Yuuta x Reader (Female)
- Okkotsu Yuuta x Zenin Maki
- Okui Tsubasa x Sera Rikka
- Okui Tsubasa x Takamura Shiki
- Okumura Eiji x Ash Lynx
- Okumura Koushuu x Sawamura Eijun
- Okumura Koushuu x Seto Takuma
- Olba x Alibaba Saluja
- Olberic Eisenberg x Cyrus Albright
- Olcott x Guel Jeturk
- Old Fritz x Prussia (Gilbert)
- Olivier Poplin x Dusty Attenborough
- Oma Kokichi x Ki-Bo (Kokiibo)
- Oma Kokichi x Momota Kaito (Oumota)
- Oma Kokichi x Saihara Shuichi (Ousai)
- Oma Kokichi x Yumeno Himiko (Oumeno)
- Omagari Ryuuji x Kite Eishirou
- Omagari Ryuuji x Tanegashima Shuuji
- Ominae Yū x Jean Jacquemonde
- Onigumomaru x Shige (Failure Ninja Rantarou)
- Onigumomaru x Yoshimaru (Failure Ninja Rantarou)
- Onimaru Kunitsuna (Touken Ranbu) x Ichigo Hitofuri
- Onimaru Kunitsuna (Touken Ranbu) x Midare Toushirou
- Onimaru Kunitsuna (Touken Ranbu) x Oodenta Mitsuyo (Touken Ranbu)
- Oniotoko x Enma
- Oniotoko x Enma (Gyagu Manga Biyori)
- Onizuka Keiji x Marcos Eringrad Garci
- Onoda (Captain Tsubasa) x Soda Makoto
- Onoda Sakamichi x Imaizumi Shunsuke
- Onoda Sakamichi x Imaizumi Syunsuke
- Onoda Sakamichi x Makishima Yusuke
- Onoda Sakamichi x Midousuji Akira
- Onoda Sakamichi x Naruko Shoukichi
- Onoda Sakamichi x Tadokoro Jin
- Onogi Kaito x Kisaragi Nanao
- Onono Imoko x Syoutokutaishi
- Onsoku no Sonic x Saitama
- Oochidori Juumonji Yari x Hanjin
- Oochidori Juumonji Yari x Saniwa (Female)
- Oodenta Mitsuyo (Touken Ranbu) x Kikkou Sadamune
- Oodenta Mitsuyo (Touken Ranbu) x Maeda Toushirou
- Oodenta Mitsuyo (Touken Ranbu) x Ookanehira (Touken Ranbu)
- Oodenta Mitsuyo (Touken Ranbu) x Saniwa (Female)
- Oodenta Mitsuyo (Touken Ranbu) x Saniwa (Male)
- Oodenta Mitsuyo (Touken Ranbu) x Sohayanotsurugi
- Oodenta Mitsuyo (Touken Ranbu) x Suishinshi Masahide
- Oogami Banri x Anesagi Kaoru
- Oogami Banri x Momo (IDOLiSH7)
- Oogami Banri x Takanashi Tsumugi
- Oogami Banri x Yotsuba Tamaki (IDOLiSH7)
- Oogami Banri x Yuki (IDOLiSH7)
- Oogami Koga x Anzu (Protagonist)
- Oogami Koga x Hakaze Kaoru
- Oogami Koga x Otogari Adonis
- Oogami Koga x Sakuma Rei
- Oogami Koga x Takamine Midori
- Oohira Hiroshi x Oonishi Hiroshi
- Ooishi Shuuichirou x Kikumaru Eiji
- Ooishi Shuuichirou x Kunimitsu Tezuka
- Ookanehira (Touken Ranbu) x Juzumaru Tsunetsugu (Touken Ranbu)
- Ookanehira (Touken Ranbu) x Koryuu Kagemitsu (Touken Ranbu)
- Ookanehira (Touken Ranbu) x Mikazuki Munechika (Touken Ranbu)
- Ookanehira (Touken Ranbu) x Saniwa (Female)
- Ookanehira (Touken Ranbu) x Uguisumaru (Touken Ranbu)
- Ooki Masanosuke x Doi Hansuke
- Ooki Masanosuke x Nomura Yuuzou
- Ooki Taiju x Ogawa Yuzuriha
- Ookurikara x Atsushi Toushirou
- Ookurikara x Gokotai
- Ookurikara x Heshikiri Hasebe
- Ookurikara x Ichigo Hitofuri
- Ookurikara x Kasen Kanesada
- Ookurikara x Kashuu Kiyomitsu
- Ookurikara x Mikazuki Munechika (Touken Ranbu)
- Ookurikara x Ookurikara
- Ookurikara x Saniwa (Female)
- Ookurikara x Saniwa (Male)
- Ookurikara x Saniwa (Touken Ranbu)
- Ookurikara x Sengo Muramasa
- Ookurikara x Shishiou (Touken Ranbu)
- Ookurikara x Shokudaikiri Mitsutada
- Ookurikara x Taikogane Sadamune
- Ookurikara x Taroutachi (Touken Ranbu)
- Ookurikara x Tsurumaru Kuninaga
- Ookurikara x Yamanbagiri Kunihiro (Touken Ranbu)
- Oomimi Ren x Kita Shinsuke
- Oomimi Ren x Suna Rintarou
- Oono Kenichi x Sakura Momoko (Maruko)
- Oono Suefumi x Motomiya Akane
- Oosako Chikara x Bambi
- Ooshiba Kiichi x Kimishita Atsushi
- Ootani Hatori x Protagonist (Stand My Heroes)
- Ootani Yoshitsugu (Sengoku Basara) x Ishida Mitsunari
- Ootani Yoshitsugu (Sengoku Basara) x Ishida Mitsunari (Sengoku Basara)
- Ootani Yoshitsugu (Sengoku Basara) x Toudou Takatora
- Ootani Yoshitsugu (Sengoku Musou) x Ishida Mitsunari (Sengoku Musou)
- Ootani Yoshitsugu x Ishida Mitsunari
- Ootori Akira x Brad Beams
- Ootori Akira x Kisaragi Ren
- Ootori Asahi x Nanase Kazuma
- Ootori Asahi x Toudou Misato
- Ootori Kyouya x Suoh Tamaki
- Ootori x Hiyoshi Wakashi
- Ootsubo Taisuke x Miyaji Kiyoshi
- Oozora Yuujin x Shinkai Haru
- Opera (Iruma-kun) x Naberius Kalego
- Opera (Iruma-kun) x Suzuki Iruma
- Optimas Prime x Drift (Transformers)
- Optimas Prime x Ratchet (Transformers)
- Orga Itsuka x Eugene Seven Stark
- Orga Itsuka x Haeda Gunnel
- Orga Itsuka x Mikazuki Augus
- Orga Sabnak x Clotho Buer
- Orga Sabnak x Shani Andras
- Orias Oswell x Bars Robin
- Orimoto Rika x Okkotsu Yuuta
- Orochi x Amano Keita
- Orochi x Kodama Fumika
- Orochimaru x Uzumaki Naruto
- Ortho Shroud x Idia Shroud
- Ortwin x Wilfried
- Oryou-san (Fate Series) x Gudako (female protagonist)
- Oryou-san (Fate Series) x Okada Izou (Fate Series)
- Oryou-san (Fate Series) x Sakamoto Ryouma (Fate Series)
- Osakabe Seiji x Asahina Yui
- Osakabe Seiji x Kirigaya Akira
- Osanai Rion x Hatohara Robato
- Oscar (Angelique) x Randy (Angelique)
- Oscar (Angelique) x Seiran (Angelique)
- Oscar (Angelique) x Victor (Angelique)
- Oscar Bale x Faith Beams
- Oscar François de Jarjayes x André Grandier
- Oshutoru x Haku (Utawarerumono)
- Oshutoru x Mikazuchi
- Osiris (ENNEAD) x Seth (ENNEAD)
- Oskar von Reuenthal x Paul von Oberstein
- Oskar von Reuenthal x Siegfried Kircheis
- Oskar von Reuenthal x Wolfgang Mittermeyer
- Oskar von Reuenthal x Yang Wen-li
- Osomatsu x Chibita (Osomatsu-san)
- Osomatsu x Choromatsu
- Osomatsu x Ichimatsu
- Osomatsu x Iyami
- Osomatsu x Juushimatsu
- Osomatsu x Karamatsu
- Osomatsu x Osomatsu
- Osomatsu x Reader (Female)
- Osomatsu x Todomatsu
- Osomatsu x Tougou (Osomatsu-san)
- Osomatsu x Yowai Totoko
- Osoto Masaki x Atori Haruto
- Osoto Masaki x Tsukahara Neko
- Otabek Altin x Yuri Plisetsky
- Otegine (Touken Ranbu) x Akashi Kuniyuki
- Otegine (Touken Ranbu) x Atsushi Toushirou
- Otegine (Touken Ranbu) x Doudanuki Masakuni
- Otegine (Touken Ranbu) x Heshikiri Hasebe
- Otegine (Touken Ranbu) x Higekiri (Touken Ranbu)
- Otegine (Touken Ranbu) x Ichigo Hitofuri
- Otegine (Touken Ranbu) x Kasen Kanesada
- Otegine (Touken Ranbu) x Mutsunokami Yoshiyuki
- Otegine (Touken Ranbu) x Nihongou (Touken Ranbu)
- Otegine (Touken Ranbu) x Nikkari Aoe
- Otegine (Touken Ranbu) x Ookurikara
- Otegine (Touken Ranbu) x Saniwa (Female)
- Otegine (Touken Ranbu) x Saniwa (Male)
- Otegine (Touken Ranbu) x Shishiou (Touken Ranbu)
- Otegine (Touken Ranbu) x Shokudaikiri Mitsutada
- Otegine (Touken Ranbu) x Tonbokiri (Touken Ranbu)
- Otegine (Touken Ranbu) x Yamabushi Kunihiro
- Otogari Adonis x Anzu (Protagonist)
- Otogari Adonis x Hakaze Kaoru
- Otogari Adonis x Kanzaki Souma
- Otogari Adonis x Narukami Arashi
- Otogari Adonis x Nito Nazuna
- Otogari Adonis x Oogami Koga
- Otogari Adonis x Sakuma Rei
- Otoishi Akira x Hazamada Toshikazu
- Otonashi Yuzuru x Hinata Hideki
- Otori Choutarou x Akutagawa Jiro
- Otori Choutarou x Hiyoshi Wakashi
- Otori Choutarou x Shishido Ryo
- Otori Choutarou x Yushi Oshitari
- Otori Eiichi x Amakusa Shion
- Otori Eiichi x Haruka Nanami
- Otori Eiichi x Kiryuuin Van
- Otori Eiichi x Otori Eiji
- Otori Eiichi x Otoya Ittoki
- Otori Eiji x Haruka Nanami
- Otori Eiji x Otori Eiichi
- Otori Itsuki (Star-Mu) x Akatsuki Kyoji (Star-Mu)
- Otori Itsuki (Star-Mu) x Hiragi Tsubasa (Star-Mu)
- Otori Itsuki (Star-Mu) x Hoshitani Yuta (Star-Mu)
- Otowa Satoi x Kamine Shota
- Otowa Shinnosuke x Fuwa Kento
- Otowa Shinnosuke x Heroine (Tokimeki Restaurant)
- Otowa Shinnosuke x Kanzaki Toru
- Otowa Shinnosuke x Tsuji Kaito
- Otoya Eita x Karasu Tabito
- Otoya Ittoki x Haruka Nanami
- Otoya Ittoki x Masato Hijirikawa
- Otoya Ittoki x Otori Eiichi
- Otoya Ittoki x Ranmaru Kurosaki
- Otoya Ittoki x Reiji Kotobuki
- Otoya Ittoki x Ren Jinguji
- Otoya Ittoki x Syo Kurusu
- Otoya Ittoki x Tokiya Ichinose
- Otoya Ittoki x Tokiya Ichinose x Otoya Ittoki
- Ou Hon (KINGDOM) x Mou Ten
- Ou Ki x Kyou (KINGDOM)
- Ou Ki x Tou (KINGDOM)
- Ou Sen x Kan Ki (KINGDOM)
- Oudou Yuuga x Sougetsu Gakuto
- Ougi Takaya x Naoe Nobutsuna
- Ouji Kazuaki x Mizukami Satoshi
- Oujou Masato x Iura Kei
- Oujou Masato x Rokugen Ayumu
- Ouka Tadaomi x Gustav Heydrich
- Oukawa Kohaku x Amagi Rinne
- Oukawa Kohaku x HiMERU (Ensemble Stars!)
- Oukawa Kohaku x Mikejima Madara
- Oukawa Kohaku x Shiratori Aira
- Ousaka Sougo (IDOLiSH7) x Nanase Riku (IDOLiSH7)
- Ousaka Sougo (IDOLiSH7) x Nikaidou Yamato (IDOLiSH7)
- Ousaka Sougo (IDOLiSH7) x Takanashi Tsumugi
- Ousaka Sougo (IDOLiSH7) x Yotsuba Tamaki (IDOLiSH7)
- Overhaul x Midoriya Izuku
- Overhaul x Toogata Mirio
- Owada Mondo x Fujisaki Chihiro (Owasaki)
- Owada Mondo x Ishimaru Kiyotaka (Mondoishi)
- Owen (Promise of Wizard) x Cain (Promise of Wizard)
- Owen (Promise of Wizard) x Magi Akira (Female Master)
- Owen (Promise of Wizard) x Magi Akira (Male Master)
- Oz (Promise of Wizard) x Arthur (Promise of Wizard)
- Oz (Promise of Wizard) x Figaro (Promise of Wizard)
- Oz (Promise of Wizard) x Magi Akira (Female Master)
- Oz (Promise of Wizard) x Magi Akira (Male Master)
- Oz (Promise of Wizard) x Mithra (Promise of Wizard)
- Oz Vessalius x Gilbert Nightray
- Ozaki Hayato x Kuze Tsugumi
- Ozaki Housai (Bungou to Alchemist) x Taneda Santouka (Bungou to Alchemist)
- Ozora Hiro x Yamano Ban
- Ozymandias (Fate Series) x Arash (Fate Series)
- Ozymandias (Fate Series) x Gilgamesh
- Ozymandias (Fate Series) x Gudao (male protagonist)
- Ozymandias (Fate Series) x Leonardo Da Vinci (Fate Series)