Staff list
- Oota Yuudai
- Oota Yuuichi
- Oota Yuuichi
- Ootomari Takaki
- Ootomo Airu
- Ootomo Airu
- Ootomo Airu
- Ootomo Hiroki
- Ootomo Hisanori
- Ootomo Kiyosato
- Ootomo Ryuuzaburou
- Ootomo Shuuichirou
- Ootomo Yuuki
- Ootori Yuuji
- Ootou Fumi
- Ootsu Airi
- Ootsubo Yuka
- Ootsuda Hiromi
- Ootsuka
- Ootsuka Akio
- Ootsuka Akira
- Ootsuka Aya
- Ootsuka Chikao
- Ootsuka Choutarou
- Ootsuka Houchuu
- Ootsuka Iwao
- Ootsuka Ken
- Ootsuka Mae
- Ootsuka Masanori
- Ootsuka Michi
- Ootsuka Miki
- Ootsuka Minami
- Ootsuka Mitsuki
- Ootsuka Miyabi
- Ootsuka Mizue
- Ootsuka Mizue
- Ootsuka Mizuki
- Ootsuka Rei
- Ootsuka Shin'ichirou
- Ootsuka Takafumi
- Ootsuka Takeo
- Ootsuka Takeo
- Ootsuka Takeshi
- Ootsuka Tomonori
- Ootsuki Kenji
- Ootsuki Renon
- Ootsuki Shin
- Ootsuki Suzuki
- Ootsuki Toshimichi
- Ootsuki Yuuko
- Ootsuki Yuuna
- Ootsuki Yuusuke
- Ootsu Nami
- Ootsuyama Chishio
- Oouchi Jun
- Oouchi Sakurako
- Oouchi Satomi
- Oouchi Tetsuya
- Oouchi Youko
- Ooura Fuyuka
- Ooura Yuuichi
- Oouso
- Oowada Hitomi
- Oowarai
- Oowatari Shouichi
- Ooyabu Natsuko
- Ooyagi Hideo
- Ooyagi Nao
- Ooyagi Shin'ichirou
- Ooya Kazuhiro
- Ooyama Aino
- Ooyama Chiroru
- Ooyama Junko
- Ooyama Keisuke
- Ooyama Kina
- Ooyama Mako
- Ooyama Miyuki
- Ooyama Nobuyo
- Ooyama Saki
- Ooyama Seiichirou
- Ooyama Tsumibito
- Ooyama You
- Ooyari Ashito
- Ooyu
- Oozawa Tomomi
- Oozono Yuno
- Oozora Itsuki
- Oozora Kojirou
- Oozora Nanami
- Oozora Naomi
- Oozora Wakaba
- Oozu Gorou
- Opai
- Opalu
- opalvision
- Opal Vision
- O Pao
- O-part, Inc.
- Open Game Art
- opengameart.org
- Operae
- ophelly
- Optaku
- Opti/200MHz
- optimisticDuelist
- Opus Co., Ltd.
- Oputo
- o-qoo
- Orange
- Orange
- Orange
- Orangebeat
- Orange Lovers
- Orange People
- orangery
- Orangeshavings
- orbitalCube
- OrcaRecords
- Ore
- Ore
- Oreiro
- Orenji
- Ore no Cosmo Kyoudai
- Oreo
- Oreo
- OrganGrinder
- Orgel
- Orgel Koubou
- Orgel Koubou Studio
- Orgel no Kobako
- Ori
- Oriana Carletto
- Orianna Greene
- Oriba Daisaku
- Oribe Nawoko
- Oribe Risa
- Ori Bney Israel
- orico
- Orie Tamaki
- Origa
- Original Up's Sound zero
- Oriha Kaname
- Orihara
- Orihara Kouhei
- Orihata Keisuke
- Orihime
- Orihime Yozora
- Orihime Yozora
- Orika Nekoi
- Orikasa Ai