Groups
- okochama heart 1
- okome drop 1
- okome soda 1
- okota to mikan 1
- okubyou yagi 1
- okurapuchi 1
- okusei 1
- olympia 1
- omamagoto no owari. 1
- omaru-kei 1
- omarunyanko 1
- omega house 1
- omegavision 1
- omikidokkuri 1
- omo no hondana 1
- omocha no yuki 1
- omocha-ya 1
- omochi baroque 1
- omochi box 1
- omochi mochi-mochi 1
- omote kanna 1
- omp 1
- omune genki 1
- on a support 1
- onaka suita domei 1
- onapo honpo 1
- onbororo 1
- one chance 1
- one day 1
- one games 1
- one-site 1
- one-two-don 1
- onemu megadeep 1
- ones pace 1
- oni puni 1
- onichan-doctor 1
- onichiku-ya 1
- onigiri manmosu shoukai 1
- oniichan club 1
- oniku 1
- onion and soup 1
- onion works 1
- oniyamadou 1
- onock tei 1
- onokanata tengoku 1
- onomimono. 1
- onsoku planet 1
- onto 1
- onyu 1
- onzskds 1