Groups
- tama land 13
- tamafuwa 13
- tamamo studio 13
- tamokuteki kuukan 13
- tanukine 13
- tata 13
- tayutau 13
- tebasaki tabetai 13
- tesuri no post 13
- thai doujinshi doukoukai 13
- thultwul 13
- tiger2drawn 13
- timenews 13
- tistrya 13
- tojora-men 13
- tokyo gunjo 13
- tokyo manga kenkyuujo 13
- tonari no yama 13
- topcat 13
- toratanuza 13
- torigara soup 13
- touch 13
- toukarachi 13
- toukibi batake de tsukamaete 13
- trance 13
- triplebunny 13
- tsuchikuda material 13
- tsurupeta kenkyuusho 13
- tsurutasousankai 13
- tukamori club 13
- tukimi atelier 13
- ultra power 13
- umon paradise 13
- undouken 13
- uni piano gakudan 13
- uohaman 13
- uozanoko 13
- urahara doll 13
- venus noire 13
- wellca 13
- witch 13
- wonder fool 13
- wonderland 13
- wougiya 13
- xptz studio 13
- yajuu kazoku 13
- yamada koubou 13
- yamadaya 13
- yaritsu 13
- yasutakeya 13