| ukulele | instrument | |
| ukuru_(valentine)_(kancolle) | character:ukuru_(kancolle) | |
| ulricawolf.bucciarati | banned_artist | |
| ultra_ball | poke_ball | |
| ultraman_decker_(dynamic_type) | character:ultraman_decker | |
| ultraman_orb_(orb_trinity) | character:ultraman_orb | |
| ultraman_tiga_(glitter_tiga) | character:ultraman_tiga | |
| ultraman_tiga_(tiga_dark) | character:ultraman_tiga | |
| ultraman_trigger_(glitter_trigger_eternity) | character:ultraman_trigger | |
| ultraman_x_(exceed_x) | character:ultraman_x | |
| ultrawide_monitor | monitor | |
| umaibou | food | |
| umbrella_flower | flower umbrella | |
| umeboshi | food fruit | |
| umeyuki | banned_artist | |
| umikaze_kai_ni_(spring)_(kancolle) | character:umikaze_(kancolle) | |
| umikaze_(swimsuit)_(kancolle) | character:umikaze_(kancolle) | |
| u_(mypace) | banned_artist | |
| unaligned_breasts | breasts | |
| unbuttoned_shirt | unbuttoned | |
| unconventional_maid | maid | |
| underbarrel_grenade_launcher | grenade_launcher weapon | |
| underboob | breasts | |
| underboob_cutout | clothing_cutout | |
| under_kotatsu | kotatsu table under_table | |
| under-rim_eyewear | semi-rimless_eyewear | |
| under_tree | tree | |
| underwear_only | underwear | |
| underwear_theft | clothes_theft theft underwear | |
| underwear_writing | clothes_writing | |