Groups
- unitonasubi 4
- unitone 1
- units 66
- uniuni 43
- universal 12 3
- universal quantification 1
- universe 1
- uniya 29
- uniyaa 60
- unizo 44
- unk.lab 1
- unknown 123
- unknown meat 63
- unknown. 3
- unko 2
- unko morimorimaru 2
- unkoya 1
- unky 20
- unlucky strike 5
- unmei no ikasumi 52
- unn slash a 1
- unnunkannun 1
- unoderi 3
- unomono 3
- unreal 8
- unshuu sakuramochi 8
- unstoppable plus 8
- unsung 1
- unti animamundi 4
- unubore 1
- unver 6
- unwonted studios 1
- unyarara daihanten 47
- unzip 1
- uohaman 13
- uohsaoh 7
- uonome tanteidan 1
- uotatsu18kinshiten 25
- uotora ryodan 7
- uousaohkoku 132
- uousaou 3
- uozanoko 13
- up down girl 2
- up1008 1
- upa24 80
- upagoya 32
- uppupunsupe 1
- upsp 3
- upstick 15
- ura 8