| Status | Name | Position | Date Registered | Posts | |
|---|---|---|---|---|---|
| UnknownWren | 2022-04-22 | 0 | |||
| Unknown_Artist | 2015-01-26 | 0 | |||
| Unknown_brony | 2015-01-23 | 0 | |||
| unknown_chan | 2017-11-21 | 0 | |||
| Unknown_Not_Responding | 2019-04-28 | 0 | |||
| Unknown_test | 2014-12-27 | 0 | |||
| Unknown_User | 2018-04-13 | 0 | |||
| Unknown_Yandere | 2021-09-05 | 0 | |||
| UnknowWeeb | 2018-07-31 | 0 | |||
| Unkonown-User | 2015-01-23 | 0 | |||
| unkown1124 | 2017-09-10 | 0 | |||
| UnkownGhost | 2022-03-19 | 0 | |||
| unkownhope87 | 2018-01-08 | 0 | |||
| Unkreativv | 2017-11-09 | 0 | |||
| unk_pone | 2014-01-26 | 0 | |||
| Unla | 2020-05-18 | 0 | |||
| Unlatrun | 2016-07-29 | 0 | |||
| Unlawful | 2023-09-12 | 0 | |||
| unleashedbrony | 2015-04-15 | 0 | |||
| UnleashedKitty | 2015-09-07 | 0 | |||
| Unlegit | 2014-06-16 | 0 | |||
| unleshdemon | 2014-08-10 | 0 | |||
| unley | 2021-04-01 | 0 | |||
| UnlicensedBrony | 2012-09-24 | 0 | |||
| Unlight | 2015-01-26 | 0 | |||
| Unlighted | 2023-06-15 | 0 | |||
| UnLiMiTeD | 2015-02-20 | 0 | |||
| UnlimitedGAMING | 2015-02-20 | 0 | |||
| UnluckyAmetyst | 2016-08-31 | 0 | |||
| UnluckyClover | 2018-07-27 | 0 | |||