Groups
- inym 13
- inyou club 6
- inyu-goya 70
- inzei seikatsu 2
- io lite 8
- ion do 1
- ion pastel 2
- ionosphere 11
- ioom 2
- ioriam 1
- iorigumi 52
- iota 4
- iota works 11
- ioteact 3
- iouke no shokutaku 2
- ip 71
- ipheion 1
- ippan hogo reigai 8
- ippan seijin 3
- ippatsu shooter 22
- ippatsutei 3
- ippeisotsu 38
- ippo mae e 36
- ippongui 59
- ippukukan 1
- ipro back dancers 2
- iq engine 1
- iq3000 5
- iqxxx 8
- ir studio 33
- irakoozu 2
- iranshiki 2
- irapon bokujou monogatari 5
- irekae tamashii 18
- irekubadou 31
- irene 7
- iriomote 77
- iris 15
- iris art 67
- iris field 11
- iris out 1
- iro murasaki 17
- iro neko pencil 4
- iro rabbit 10
- iroamisogi-dan 4
- irodori 94
- irodori midori 3
- irodorip 11
- irodoriya 1
- iroemon 2