| Overseer's DeskNPC #228049 | Unknown | Normal | Identity record |
| Overseer's EyeNPC #109420 | Unknown | Normal | Identity record |
| Oversized BasiliskNPC #190333 | Unknown | Normal | Identity record |
| Oversized CandleNPC #255972 | Unknown | Normal | Identity record |
| Oversized GronnlingNPC #82932 | Unknown | Normal | Identity record |
| OversparkNPC #155435 | Unknown | Normal | Identity record |
| Overspritzed GuardNPC #116285 | Unknown | Normal | Identity record |
| Overstuffed GolemNPC #45851 | Unknown | Normal | Identity record |
| Overstuffed SauroliskNPC #124375 | Beast | Normal | Identity record |
| Overtaken MatriarchNPC #248715 | Beast | Normal | Identity record |
| Overtaken VoidcasterNPC #257618 | Unknown | Normal | Identity record |
| Overthane BalargardeNPC #31016 | Unknown | Normal | Identity record |
| Overthrown ArtisanNPC #184535 | Unknown | Normal | Identity record |
| Overthrown ArtisanNPC #185827 | Mechanical | Special | Identity record |
| Overthrown ArtisanNPC #186106 | Unknown | Normal | Identity record |
| Overthrown ProtectorNPC #184533 | Unknown | Normal | Identity record |
| Overthrown ProtectorNPC #185154 | Unknown | Normal | Identity record |
| Overthrown ProtectorNPC #185155 | Unknown | Normal | Identity record |
| Overthrown ProtectorNPC #186105 | Unknown | Normal | Identity record |
| Overthrown ProtectorNPC #186128 | Unknown | Normal | Identity record |
| Overturned CartNPC #252539 | Unknown | Normal | Identity record |
| Overturned HatchlingNPC #193470 | Unknown | Normal | Identity record |
| Overwatch Mark 0NPC #20420 | Unknown | Normal | Identity record |
| Overwatch Mark INPC #3538 | Unknown | Normal | Identity record |
| Overwatch Mark INPC #97612 | Unknown | Normal | Identity record |
| Overwatch SwarmiteNPC #225019 | Unknown | Normal | Identity record |
| Overwhelm TesterNPC #75837 | Unknown | Normal | Identity record |
| Overwhelmed AspirantNPC #157652 | Unknown | Normal | Identity record |
| Overwhelmed CaretakerNPC #251121 | Unknown | Normal | Identity record |
| Overwhelmed EngineerNPC #181835 | Unknown | Normal | Identity record |
| Overwhelmed HandlerNPC #251417 | Unknown | Normal | Identity record |
| Overwhelmed MagisterNPC #275209 | Unknown | Normal | Identity record |
| Overwhelmed RangerNPC #254997 | Unknown | Normal | Identity record |
| Overwhelmed RecruitNPC #260245 | Unknown | Normal | Identity record |
| Overwhelmed RecruitsNPC #254747 | Unknown | Normal | Identity record |
| Overwhelmed RecyclerNPC #181836 | Unknown | Normal | Identity record |
| Overwhelmed RepairbotNPC #225200 | Unknown | Normal | Identity record |
| Overwhelmed ScoutNPC #240546 | Unknown | Normal | Identity record |
| Overwhelmed VenomguardNPC #262282 | Unknown | Normal | Identity record |
| Overwhelming ConfusionNPC #161829 | Unknown | Normal | Identity record |
| Overwhelming DarknessNPC #237528 | Unknown | Normal | Identity record |
| Overwhelming NightmareNPC #109249 | Unknown | Normal | Identity record |
| Overwhelming PowerNPC #69645 | Unknown | Normal | Identity record |
| Overworked CookNPC #220744 | Unknown | Normal | Identity record |
| Overworked Honey BeeNPC #232487 | Unknown | Normal | Identity record |
| Overworked Honey BeeNPC #232503 | Unknown | Normal | Identity record |
| Overworked Honey BeeNPC #240891 | Unknown | Normal | Identity record |
| Overworked Kaja'minerNPC #225849 | Unknown | Normal | Identity record |
| Overworked Kaja'minerNPC #230694 | Unknown | Normal | Identity record |
| Overworked MechanicNPC #234985 | Unknown | Normal | Identity record |
| Overworked MinerNPC #220631 | Unknown | Normal | Identity record |
| Overworked NagNPC #23747 | Beast | Normal | Identity record |
| Overworked PeonNPC #237482 | Unknown | Normal | Identity record |
| Overworked PeonNPC #239682 | Unknown | Normal | Identity record |
| Overworked ScholarNPC #199491 | Unknown | Normal | Identity record |
| Overworked UnderlingNPC #156441 | Unknown | Normal | Identity record |
| Overwrought OtterNPC #193580 | Critter | Normal | Identity record |
| Overzealous BloomNPC #191099 | Unknown | Normal | Identity record |
| Overzealous HulkNPC #153064 | Unknown | Normal | Identity record |
| Overzealous HulkNPC #155643 | Humanoid | Special | Identity record |