| Status | Name | Position | Date Registered | Posts | |
|---|---|---|---|---|---|
| UnstableBread | 2023-03-25 | 0 | |||
| UnstableBrony | 2013-07-08 | 0 | |||
| Unstackable | 2022-05-27 | 0 | |||
| Unstoppable | 2014-10-20 | 12 | |||
| unstoppable-bookworm | 2013-07-09 | 0 | |||
| UnstoppableRemix | 2014-08-09 | 0 | |||
| unsurbtots | 2019-10-04 | 0 | |||
| Unsuspicious | 2014-01-24 | 0 | |||
| unsweetened | 2020-02-22 | 0 | |||
| Untailygean | 2013-07-08 | 0 | |||
| Untalkative Bee | 2016-07-29 | 0 | |||
| UntamedFirecetalon | 2014-06-23 | 0 | |||
| untamedfirecetalonn | 2014-08-08 | 0 | |||
| UntD0 | 2018-08-13 | 0 | |||
| UntenArt | 2018-08-30 | 0 | |||
| Unter | 2023-09-07 | 0 | |||
| UntilDawn2003 | 2016-01-28 | 0 | |||
| UntilTheEndOfTime | 2015-04-20 | 0 | |||
| untilthesungoesdown | 2024-04-04 | 1 | |||
| Untiring Quill | 2014-04-18 | 0 | |||
| Untitled | 2017-09-18 | 0 | |||
| Untitled Spy | 2016-07-29 | 0 | |||
| Untitled-312 | 2019-07-28 | 0 | |||
| Untitled312 | 2020-02-15 | 0 | |||
| UntitledCopy | 2012-04-27 | 4 | |||
| UntitledKatrina | 2017-09-16 | 0 | |||
| Untitled_Dot_V | 2014-08-10 | 0 | |||
| Untold Story | 2015-08-15 | 0 | |||
| untrapito | 2018-01-09 | 0 | |||
| Untry | 2016-05-04 | 0 | |||