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Oguma is the main antagonist from the PlayStation 2 Metal Slug 3D.


Oguma is the CEO of the Oguma Corporation, a powerful and technologically advanced company that has obtained fame through various useful gadgets. He allies himself with General Morden to decipher a treasure that the general found 10 years before the game begins. This mysterious device is known as the Alator and it's capable of creating destructive weapons superior to anything else on the earth.

Near the end of the game, Oguma betrays Morden by "taking back" the Alator. He reveals to Marco and company that he is actually a member of the Tuatha de Danann, an advanced race of beings that live in an age three hundred million years in the past. They placed the Alator on earth three hundred million years ago as an information gathering device and intend to bring it back with them to the past. With the Alator, they intend to continue evolving their culture and erase the current timeline for their ideal history.

Once his race reaches their evolutionary peak, it inevitably self-destructs. To prevent this, they began their experiment by placing an Alator on a planet. The Tuatha de Danann sleep for three hundred million years and awake to retrieve the gathered information. If the world they examined clashes too much with their history, they will simply erase the world's current history and start the experiment over. Oguma states that they have repeated the same experiment countless times before and have recorded each instance to avoid his race's evolutionary self-destruction. Later, Marco and company believe that Oguma's experiments have caused an open rift in the space-time continuum.

He unlocks the Alator and it erects the tower giant, Lugus. While he transfers the information from Lugus to their records, the four heroes stand against them to save their history. After they defeat Lugus, another tower giant from one of Oguma's previous experiment (Lieu) absorbs it. When this happens, his culture's collected data is erased and he is forced to tame the wild new creation. Marco and his crew decide to destroy it to prevent anymore damage to the world's timeline. In spite of their efforts, the Tuaha de Dunan fail to control it and prepare to meet their final end. Before his apparent demise, Oguma flashes a brief knowing smile to the player just before he is engulfed by the living weapon.

However, Oguma manages to survive and is last seen approaching Rumi Aikawa. Expressing his sincere hope that her people may yet be able to learn from the mistakes of his, Oguma leaves the data disc of his people's history with her. Oguma is last seen turning around and calmly walking away.


Composed and wizened, Oguma is a polite scientist. He believes his actions are part of a large experiment that shouldn't be interrupted. In the end, he eventually believes in the power of humanity, partially due to Marco insisting that he lives for the future.

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Metal Slug 3D
Major Characters Marco RossiEri KasamotoTarma RovingFio Germi
Supporting Characters Rumi Aikawa
Antagonists Donald MordenAllen O'NeilOguma
Organizations Regular Army (Peregrine FalconsS.P.A.R.R.O.W.S) • Rebel ArmyOguma Corporation
Bosses M-3 Rocket Launch Support VanMosque ArtillerySpider-BotUnderground Cruise MissileMorden's BattleshipMorden's CastleAllen O'NeilLugusLieu
Weapons Heavy Machine GunRocket LauncherLaser GunShotgunFlame ShotEnemy ChaserIron LizardSuper GrenadeDrop ShotDouble Machine GunGrenadeFire BombMonolithSniper RifleSmoke Bomb
Slugs SV-001Slug GunnerSlug FlyerSlug Mariner
Missions Start From Mountain VillageBe Headquartered in the CityDesert TownCoal Mine MarkCoal Underground RuinsAtmospheric DischargeBreak the BarrierSink Under the WavesThe South PoleClimb the TowerOut of Control
Heroes Main Series Marco RossiTarma RovingEri KasamotoFio GermiTrevor SpaceyNadia CasselRalf JonesClark StillLeona Heidern
Spin-Offs Walter RyanTyra ElsonHeroGimletRed EyeTequila
Mobile Roberto NicolaNathalie NeoAlisa StewartHeltonTildeNikitaMatildaAmirWhipHeidern
Support Hyakutaro IchimonjiRumi AikawaMadoka AikawaUtanNavelSelinaIssenman TarouErisHyakumantaroPupipi
Villains Main Series Donald MordenAllen O'NeilAbul AbbasRootmarsDoctorAvatar of EvilInvader King
Spin-Offs Allen Jr.OgumaMacbaLt. WiredKananHilde Garn
Mobile Unknown AlienVictorPtolemaiosAnubis the ChainedNanook
Instructors Sophia GreenvilleMargaret SouthwoodRiviera von WittenbergMaryell von WittenbergCynthia HartnettAnne
NPC AnnouncerPOWsDuke KoudouSatiko SuzukiGerhardt City CiviliansScott Amundsen Jr.MinerGenie of LampOrcaPresidentSurvivorsFishmanLumberjackSailorChinese Soldier
Crossover KOF TeamBattle Cats
Unused Phil GeneMichiko NakajimaAngry Man • "Achilles" • "Tabomba"
Metal Slug: Commander MerrisDalia
Metal Slug: Awakening Goddess AncorCatherine
Metal Slug Attack
Regular Army Associates MS-AliceAnna WieseMidori SchumannMelloRita LewinskyAmberNikitaReika BradfordLouiseGiseeMS-HeartAshleyRockyGrowlJephetVictoriaClaudiaKanaeHowellPhiElizabeth MarianiUndoCharlotte
Metal Device Project PercheAmiMollyMenzelUlalaMaggieAvvioQuaithKaren
Rebel Army Associates RapidJuliaChloeIzabellaEddaGrowth & ClineNaomiAleshaJane Doe
ACE AbigailDionRomyKriemhildKatalina
"Frozen Brigade" BeatrizVickyDolores
Blaze Brigade GraziaLorettaNorah
Allen Platoon DestradeHuracanConnyNantesPadwahOlgaVirginia
Science Department VitaNavyNovaEmmaMillefieSylfieFluffyEight Eight
Arabian Army ShizukaAisha
Ptolemaic Army Rebellion DragunovYoshinoCarolineVeronicaSisiliaTowaSimonMiharuChunyanOwenShoLucyPhoebeJosetteMizunaMatildaLittle Lady BlackSvetlaHumphreyLithosYutongTatyanaCicaLinhua
Cultists Mira D. GenesisMariaDamianAchettoSallyCaraOao-OneSorceress
Secret Sect Anastasia IVBelieversBeechamMelvinaAnastasia IZahara
Others Reverse Trinity
Space Army Martians Professor "Aionion"Mars People NeoPercierClone AbbyClone BettyMars People RangersAriadnaGemini TwinsHalleBonnyClarioHarriotCode Marionette:UnPaulineLeoneClarisDracoRaubtierMalkuth
Invaders OdetteAnnetteLydiaNowanSchwarz MetzeleiFedeln MetzeleiRillacleFrankeTelekoBloom MetzeleiOdileBersekGeweih MetzeleiPurple KingBarbelnBiene GoldenesSwordeistDrache GoldenesEis MonstrumAi AgateLiebenGoldenes Krieger
Unaffiliated UnsignedLi Lin
Independent Army Amadeus Syndicate White BabyAlmaOttoIron FortressValerian BearsFirst BabyType:Ant-LionMelk
Red Goblin Society Scotia AmundsenRed GoblinVatnJinAileenElenaLichtIchimaWendyBushin TenzanMaki
Mummy Army PharaohCleopatraHemetArsinoeHatholSharifaRamalSekhatWepset
Vampires AswangAgaliaSharlGrace
"World Military Corp." KellyMayaMirror Mantis
Mirage Circus CocatrixBunny
Unaffiliated El DoradoElysionEstherTeresaMinervaYang DaoYuki Tsuki HanaIdoPhiliaHisui