Obsidian - Vehicon Aerial Combat
Obsidian - Decepticon Helicopter
Obsidian (Transformers: Universe) - Decepticon Aerial Combat
Oceanglide - Mini-Con
Oceanglide (Recolor) - Mini-Con
Octane - Decepticon Fueler
Octopunch - Decepticon Salvage
Offshoot - Autobot
Oil Slick - Decepticon
Oiler - Autobot Urban Protection
Omega Prime - Autobot
Omega Prime (Transformers: Universe) - Autobot
Omega Sentinel - Autobot
Omega Spreem - Autobot Defense Base
Omega Supreme - Autobot Defense Base
Omega Supreme (Energon) - Autobot
Onslaught - Decepticon Combaticon Leader
Onslaught (Generation 2) - Decepticon Combaticon Leader
Onyx Primal - Maximal Predacon Assassin / Infiltrator
Optimal Optimus - Maximal Supreme Commander
Optimus Minor - Maximal Ground Commando
Optimus Primal - Maximal General
Optimus Primal (Gorilla) - Maximal General
Optimus Primal (Transmetal) - Maximal General
Optimus Primal (Beast Machines) - Maximal Commander
Optimus Primal (McDonald's) - Maximal
Optimus Primal (Blast Punch) - Maximal Leader
Optimus Primal (Air Attack) - Maximal Autobot Spirit Guide
Optimus Primal (Transformers: Universe) - Autobot
Optimus Prime - Autobot Commander
Optimus Prime - Autobot Decoy #31
Optimus Prime (Powermaster) - Autobot Leader
Optimus Prime (Action Master) - Autobot Commander
Optimus Prime (Generation 2) - Autobot Commander
Optimus Prime (Hero) - Autobot Leader
Optimus Prime (Laser) - Autobot Leader
Optimus Prime (Go-Bot) - Autobot Leader
Optimus Prime (Machine Wars) - Autobot Leader
Optimus Prime (Powermaster Commemorative II) - Autobot Leader
Optimus Prime (Apex Armor) - Autobot Defense Commander
Optimus Prime (Smallest TF) - Cybertron
Optimus Prime (Spychanger) - Autobot Leader
Optimus Prime (20th Anniversary) - Autobot Leader
Oprimus Prime (Smallest TF Anime) - Cybertron Leader
Optimus Prime (RiD) - Autobot Leader
Optimus Prime (RiD Spy Changer) - Autobot
Optimus Prime (Transformers: Universe) - Autobot
Optimus Prime (TF:U Spychanger) - Autobot
Optimus Prime (Armada) - Autobot
Optimus Prime (McDonald's) - Autobot
Optimus Prime (Super-Con) - Autobot
Optimus Prime (Powerlinx) - Autobot
Optimus Prime (Built To Rule) - Autobot
Optimus Prime (K-Mart Gold) - Autobot Leader
Optimus Prime (Energon) - Autobot
Optimus Prime (Powerlinx Deluxe) - Autobot
Optimus Prime (Costco) - Autobot
Optimus Prime (Energon McDonald's) - Autobot
Optimus Prime (Cybertron) - Autobot
Optimus Prime (Burger King) - Autobot
Optimus Prime (Legends of Cybertron) - Autobot
Orcanoch - Maximal
Orion Pax - Cybertron Frieght Handler
Outback - Autobot Gunner
Oval - Mini-Con
Oval (Cybertron) - Mini-Con
Over-Run - Autobot Air Defense
Over-Run - Mini-Con
Over-Run (Transformers: Universe) - Mini-Con
Overbite - Decepticon Undersea Terminator
Overbite (Transformers: Universe) - Decepticon
Overcast - Autobot
Overcharge - Destron Spaceborne Trooper
Overdrive - Autobot Strategist
Overflow - Autobot Regional Ground/Air Defense
Overhaul - Autobot
Overkill - Decepticon Warrior
Overload - Autobot Troop Transport
Overload (Armada) - Autobot
Overload (Costco) - Autobot
Overload (Transformers: Universe) - Autobot
Overlord - Destron Ambassador of Destruction
Override - Autobot Scout
Override (Cybertron) - Autobot
Override GTS - Autobot
Ox (Clear) - Cybertron Charger Ninja
Ox (Super) - Cybertron
Ox (Clear Super) - Cybertron