Groups
- o-chu-gen 3
- o-g-g 1
- o-gon pudding 11
- o-hana no mise myonmyon 1
- o-mars 51
- o-mega 6
- o-penguin 7
- o-type earthly desires submarine 1
- o-yukikeihou 6
- o.l.b 1
- o.man.co 4
- o.n art works 41
- o.n art works 8
- o.riginal brand 23
- o.s 21
- o.s 21
- o.w.l. 2
- o157 59
- oasis 9
- oasis plus 36
- oat and meal 5
- ob 2
- oba-q honpo qt 7
- obake candle 23
- obake no ringoya-san 8
- obasuko soul 3
- oberkochen 8
- oblate 1
- oboreta slyme 2
- oboro 9
- oboro and tempo gensui dou 107
- oboro hyakuhachishiki 11
- oboro mitsurin dan 3
- obscurasoft 1
- obscurite 2
- obsession. 41
- obsession. 20
- obsidian 5
- obsidian order 32
- obukko 1
- obumanjuu 42
- oburigakko 3
- oc-black 2
- oc5 3
- ocarina 34
- occhoko-cho 2
- occult arms 1
- oce0 1
- ocean chain 2
- oceans11 2