Groups
- oozora kaiko 59
- op88 1
- opagi 2
- opalescence 1
- opaque 51
- open book 17
- open heart 1
- open mind 1
- open road 4
- opera 4
- operating room 12
- operation 1
- operation panel 2
- operation-50 7
- opereperkep 4
- operetta 2
- operetta due 2
- opink shougun 8
- oppai baibai 30
- oppai brothers 6
- oppai click 5
- oppai daisuki tarou 9
- oppai empire 3
- oppai ga ippai 1
- oppai guild 14
- oppai kikaku 1
- oppai mochi 6
- oppai renmei kantai 2
- oppeke hei 2
- oppi 3
- opt 3
- optim 7
- optimism small country 15
- optimist 1
- optimistic 1
- option 5 2
- optworks 14
- opuntia 1
- oqizome 1
- orabgeta 1
- oracion 1
- oracle eggs 23
- orange 5
- orange blossom 8
- orange box 12
- orange brand 30
- orange bullet 49
- orange caramel. 2
- orange channel 55
- orange chocolat 12