[[quoteright:350:https://static.tvtropes.org/pmwiki/pub/images/liam_4.jpg]]

->''[[WebSite/TextsFromLastNight (978)]]: His voice is like sex for ears... Which sounds so wrong, but so right at the same time.''
-->--'''[[VideoGame/FinalFantasyXIII Lightning]]''', ''[[http://textsfromffxiii.tumblr.com/ Texts from FFXIII]]'' (as noted by Creator/AliHillis)

Liam O'Brien (born May 28, 1976 in Weehawken, New Jersey) is an American voice actor. Chances are that if you notice a character who seems [[AristocratsAreEvil aristocratic]] or [[RoyallyScrewedUp have noble standing]], they'll have this guy voicing them. Most likely characteristics of his voice are an almost-faux British accent, [[EvilSoundsRaspy gruff]], or a very laid-back demeanor. And he doesn't differentiate that much--

--''[[WebVideo/NarutoTheAbridgedSeries "You want any voice differentiation? That's Gaara!"]]''

His real forte seems to be voicing characters who have more than a few screws loose in their head, from the eccentric to the [[AxCrazy completely insane]]. In fact, this is what shot him to fame when he voiced Gaara in ''Manga/{{Naruto}}''. He has a knack for AmbiguouslyGay characters, and one heck of an EvilLaugh that's present in just about every villain he's ever played.

He's married to fellow voice actress Amy Kincaid (who played Shirley Fenette in ''Anime/CodeGeass'' and Kotone Himekawa in ''VisualNovel/ToHeart'') with two kids, and also does a butt-load of ADR directing (most notably for the ''Franchise/ResidentEvil'' series).

He has a Website/{{Twitter}} [[https://twitter.com/VoiceOfOBrien account]] and started a podcast, "[[http://allworknoplay.podbean.com/ Allworknoplay]]", with fellow voice actor Creator/SamRiegel. He is one of the [[CatchPhrase nerdy-ass voice actors]] starring weekly in the ''TabletopGame/DungeonsAndDragons'' campaign ''WebVideo/CriticalRole''.

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!!Notable roles from Liam O'Brien:
!!!Anime
* Archer, aka [[spoiler: Heroic Spirit Emiya]], in ''VisualNovel/FateStayNight'' and the ''Unlimited Blade Works'' movie
** Kariya Matou in ''Literature/FateZero''
* Dan Moroboshi in ''Manga/{{Ultraman}}''
* Dr. Clive in ''Anime/HareGuu''
* Dizelmine in ''Anime/LagrangeTheFlowerOfRinne''
* Frisbee in ''Anime/RedLine''
* Gaara in ''Manga/{{Naruto}}''
* Hideaki Asaba in ''Manga/HisAndHerCircumstances''
* [[TheEmpath Hisoka Kurosaki]] in ''Manga/DescendantsOfDarkness''
* Jushiro Ukitake, Soken Ishida, and Sora Inoue in ''Manga/{{Bleach}}''
* Junta Momonari/Mega Playboy in ''Manga/DNA2''
* Kazuharu Fukuyama in ''Manga/GirlsBravo''
* Gihren Zabi in ''Manga/MobileSuitGundamTheOrigin''
* Dr. Kenzo Tenma in ''Manga/{{Monster}}''
* Kine and Yodogiri Jinnai in ''[[Literature/{{Durarara}} Durarara!!x2]]''
* Kotone Seiryuin in ''Anime/SakuraWarsTheMovie'' (one of his first LA roles; uncredited)
* Krumly in ''VideoGame/BatenKaitos''
* Lloyd Asplund in ''Anime/CodeGeass''
* Lunatic/Yuri Petrov in ''Anime/TigerAndBunny''
* Mamiya Chida in ''Anime/RevolutionaryGirlUtena''
* Detective Maniwa in ''Anime/ParanoiaAgent'' (starting with Episode 5)
* Marquis Andrea Cavalcanti/Benedetto in ''Anime/{{Gankutsuou}}''
* Nephrite in the Viz dub of ''Manga/SailorMoon''
* Kitty-Poo, OVER, and Not-Nice Cream in ''Manga/BoboboboBobobo''
* Ray Lundgren in ''Anime/GunXSword''
* Rezo the Red Priest in ''Literature/{{Slayers}} Revolution'' and ''Evolution-R''
* Shichigoro in ''Anime/AfroSamurai: Resurrection''
* Shobu Kirifuda (second voice) in the short lived dub of ''Anime/DuelMasters'' ([[TheOtherDarrin Originally voiced by]] Joshua Seth)
* Taishi Kuhonbutsu in ''VisualNovel/ComicParty'' (darrin'd by Creator/JessieJamesGrelle in ''Comic Party Revolution'')
* Tokugawa Ieyasu in ''VideoGame/SengokuBasara'' (both the anime, albeit uncredited, and ''Samurai Heroes'')
* Tsubasa in ''Manga/DestinyOfTheShrineMaiden''
* Walter C. Dornez (Young Adult form) in ''[[Manga/{{Hellsing}} Hellsing Ultimate]]''
* Vincent Law from ''Anime/ErgoProxy''

!!!Film
* Red XIII in ''Anime/FinalFantasyVIIAdventChildren''

!!!Video Games
* Additional radio voices in ''VideoGame/GrandTheftAutoV''
* Air Raid in ''VideoGame/TransformersWarForCybertron''
* Akihiko Sanada in ''VideoGame/{{Persona 3}}'', ''VideoGame/PersonaQShadowOfTheLabyrinth'', ''VideoGame/Persona4Arena'', ''VideoGame/Persona4ArenaUltimax'', ''VideoGame/Persona3DancingInMoonlight'', and ''VideoGame/BlazBlueCrossTagBattle''
** Officer Kurosawa in ''VideoGame/Persona3Reload''
* Asura from ''VideoGame/AsurasWrath''
* Ayatane Michitaka in ''VideoGame/ArTonelicoMelodyOfElemia''
* Baldren Gassenarl from ''VideoGame/ValkyriaChroniclesII''
* Caius Ballad in ''VideoGame/FinalFantasyXIII2'' and ''VideoGame/LightningReturnsFinalFantasyXIII''
* Cent in ''VideoGame/{{Drakengard 3}}''
* Chaos in ''VideoGame/AtelierIris2TheAzothOfDestiny''
* Chuck Preston in ''VideoGame/{{Wild ARMs 5}}''
* Dr. Stahngun[[spoiler:/Dimitri Allen]] in ''VideoGame/ProfessorLaytonAndTheUnwoundFuture''
* Clark Triton in ''VideoGame/ProfessorLaytonAndTheLastSpecter''
* Cu Chaspel in ''VideoGame/FinalFantasyCrystalChroniclesRingOfFates''
* Darkdeath Evilman [[spoiler:the suit, not the pilot]] in ''VideoGame/ZettaiHeroProject''
* David in ''VideoGame/KillerIsDead''
* Dio in ''VisualNovel/VirtuesLastReward''
* ComicBook/DoctorStrange in ''VideoGame/MarvelVsCapcomInfinite'' and ''VideoGame/MarvelRivals''
* Durant in ''VideoGame/YggdraUnion''
* [[DudeLooksLikeALady Endrance]] in the ''[[VideoGame/DotHackGU .hack//G.U.]]'' trilogy
* Enkidu Uruk in ''VideoGame/FinalFantasyType0''
* ''Franchise/FireEmblem'':
** Inigo in ''VideoGame/FireEmblemAwakening''
** [[RoleReprise Laslow]], Izana, and Zola in ''VideoGame/FireEmblemFates''
* Gaul in ''VideoGame/StarTrekOnline''
* The Ghost and Science Vessel units in ''VideoGame/StarcraftII''
* Gill in ''VideoGame/StreetFighterV''
* Gollum in ''VideoGame/MiddleEarthShadowOfMordor'' and ''VideoGame/MiddleEarthShadowOfWar'' [[note]]His impression of Creator/AndySerkis is creepy good and almost indistinguishable from the original.[[/note]]
* Goto in ''VideoGame/ManaKhemia2FallOfAlchemy''
* Grimoire Weiss in ''[[VideoGame/NieR NieR Gestalt]]'' and ''[[UpdatedRerelease NieR Replicant ver.1.22474487139...]]''
* ''VideoGame/GuiltyGear'':
** [[{{Bishonen}} Ky Kiske]] in ''Guilty Gear 2 Overture''
** [[ChivalrousPervert Axl Low, Johnny]], and [[MalevolentMaskedMan Chronus]] in ''Guilty Gear Xrd''
** He reprises Johnny in ''VideoGame/GuiltyGearStrive''
* Illidan Stormrage in ''VideoGame/WorldOfWarcraft'', ''VideoGame/HeroesOfTheStorm'', and ''VideoGame/{{Hearthstone}}''
* Ingway in ''VideoGame/OdinSphere''
* Isaac in ''VideoGame/CastlevaniaCurseOfDarkness''
* [=ISA=] Multiplayer Announcer in ''VideoGame/CallOfDutyBlackOpsII''
* Joachim Armster in ''VideoGame/CastlevaniaLamentOfInnocence''
* Jonathan Morris in ''VideoGame/CastlevaniaPortraitOfRuin''
* Kain Highwind in ''VideoGame/FinalFantasyIV'' (DS), ''[[VideoGame/DissidiaFinalFantasy Dissidia 012: Final Fantasy]]'', and ''[[VideoGame/DissidiaFinalFantasy2015 Dissidia Final Fantasy NT]]''
* Leviathan and Dr. Avian in ''VideoGame/{{Skullgirls}}''
* Levin [[spoiler:and Raksha]] in ''VideoGame/SoulNomadAndTheWorldEaters''
* Lezard Valeth in ''VideoGame/ValkyrieProfile2Silmeria''
* Master Big Star in ''VideoGame/{{Disgaea 3|Absence of Justice}}''
* Miguel Caballero Rojo in ''VideoGame/{{Tekken}} 6''
* Motormaster and generic Seekers in ''VideoGame/TransformersDevastation''
* Mugen in the ''Anime/SamuraiChamploo'' video game (substituted for Creator/SteveBlum due to Steve's union status)
* Navarre, [[spoiler:Herald Uriel]], and Yamato-Takeru in ''VideoGame/ShinMegamiTenseiIV''
* Niall in ''VideoGame/DragonAgeOrigins''
* Swordmaster Nobutsuna Kamiizumi in ''VideoGame/BravelyDefault'' and ''VideoGame/BravelySecond''
* Orlando Haddick in ''VideoGame/{{Catherine}}''
* Pacer, Cachino, Major Knight, Jerry the Punk, and numerous other male [=NPCs=] in ''VideoGame/FalloutNewVegas''
* Phillip Cheney[[spoiler:/DELTA]] in ''{{VideoGame/D4}}: Dark Dreams Don't Die''
* P.M.C Multiplayer Announcer in ''VideoGame/CallOfDuty: VideoGame/ModernWarfare 3''
* Reverse-Flash [[spoiler:and Brainiac 5]] in ''VideoGame/Injustice2''
* Reynard Fisher (Chris and Sheva's contact in Chapter 1) in ''VideoGame/ResidentEvil5'' (he also did the ADR directing)
* Rig in ''VideoGame/DeadOrAlive5''
* Robert "Barker" Taube in ''VideoGame/{{Titanfall}}''
* Roderick, Bogdan, Alexei in ''VideoGame/DungeonSiege III''
* Sanctus in ''VideoGame/DevilMayCry4''
* Serafen in ''VideoGame/PillarsOfEternityIIDeadfire''
* ''Franchise/SonicTheHedgehog'':
** Zazz in ''VideoGame/SonicLostWorld''
** [[Characters/SonicTheHedgehogInfinite Infinite]] in ''VideoGame/SonicForces''
* Sterkenberg Cranach in ''VideoGame/AtelierRoronaTheAlchemistOfArland'' and its [[VideoGame/AtelierTotoriTheAdventurerOfArland followup]] [[VideoGame/AtelierMeruruTheApprenticeOfArland games]]
* Steven Bisson in the ''Anime/EurekaSeven'' video games
* ''VideoGame/TalesSeries'':
** Dist the Rose in ''VideoGame/TalesOfTheAbyss''
** [[VideoGame/TalesOfDestiny Stahn Aileron]] in ''[[VideoGame/TalesOfTheWorld Tales of the World: Radiant Mythology]]''
** Cumore in ''VideoGame/TalesOfVesperia''
** Gilland in ''VideoGame/TalesOfXillia''
* [[HeManWomanHater Tsugarubi]] in ''VideoGame/SakuraWarsSoLongMyLove''
* Vayne Aurelius in ''VideoGame/ManaKhemiaAlchemistsOfAlRevis''
* Count Waltz in ''VideoGame/EternalSonata''
* War in ''VideoGame/{{Darksiders}}''
* Creator/WilliamShakespeare and UsefulNotes/VladTheImpaler in ''VideoGame/SaintsRowGatOutOfHell''
* The male Warden in ''VideoGame/ForHonor''
* The Waysider PlayerCharacter in ''[[VideoGame/LostPlanet Lost Planet 2]]''
* Yasha's English voice in ''VideoGame/OnmyojiArena''
* [[Characters/LeagueOfLegendsYasuo Yasuo]] in ''VideoGame/LeagueOfLegends''

!!!Web Video
* Cosmo Grimm (Chapter 3) in Candela Obscura
* Vax'ildan Vessar (Campaign 1), Caleb Widogast (Campaign 2), and Orym (Exandria Unlimited, Campaign 3) in ''WebVideo/CriticalRole''

!!!Western Animation
* Boswell the magician in ''WesternAnimation/SofiaTheFirst''
* Imperial Supply Master Yogar Lyste, Morad Sumar, and additional voices in ''WesternAnimation/StarWarsRebels''
* Professor Maelstrom and The Cleaners in ''WesternAnimation/CarmenSandiego''
* Nightcrawler, Nitro, and Angel[=/=]Archangel in ''WesternAnimation/WolverineAndTheXMen2009''
* Red Skull in ''WesternAnimation/AvengersAssemble'', ''WesternAnimation/PhineasAndFerbMissionMarvel'', and ''WesternAnimation/IronManAndCaptainAmericaHeroesUnited''
** ComicBook/DoctorStrange in ''WesternAnimation/UltimateSpiderMan2012'' and ''Avengers Assemble'' ([[TheOtherDarrin taking over from]] Creator/JackColeman)
* Underbite in ''WesternAnimation/TransformersRobotsInDisguise''
* Vax'ildan Vessar and Vorugal in ''WesternAnimation/TheLegendOfVoxMachina''
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!![[VideoGame/WorldOfWarcraft THESE TROPES!! ARE NOT!! PREPARED!!!]]
* AxCrazy: What a lot of his characters have in common. If the character is a good guy, the character is most likely a SociopathicHero, one with a DarkAndTroubledPast, a BloodKnight, an AntiHero, or [[HeelFaceTurn a former villain turned good guy/antihero]]. If the character is a bad guy, the character he voices is most likely going to be a SmugSnake, a ManipulativeBastard, a MadScientist, a PsychopathicManchild, a VillainProtagonist, [[AristocratsAreEvil an evil noble]], or one without any redeeming qualities.
* DeadpanSnarker: If his Twitter account is any indication, he's got a killer sense of humor. It should also be noted that some of his characters he voices sometimes make sarcastic remarks.
* EvilSoundsDeep: If the character he voices happens to have a deep voice, then they are most likely are going to be villains. If the villain has a higher pitched voice, then said villain is going to be ''[[AxCrazy psychopathic]]''.
* EvilLaugh: He's ''very'' fond of this.
* EvilSoundsRaspy: Even when playing an [[AllLovingHero unambiguously good man]] like [[Manga/{{Monster}} Dr. Tenma]], his voice has this quality.
* HeterosexualLifePartners: With Creator/SamRiegel. Their joint podcast makes it abundantly clear that they're [=BFFs=]. At one point Liam O'Brien challenges them both to pick which male voice actor they would marry if given the option - and the challenging part is that they're not allowed to pick each other.
* ManOfAThousandVoices: We have Gaara, Lloyd, and Dr. Clive for starters, but he's really capable of others. Also, [[LampshadeHanging his official resume lists]] British, Cockney, Spanish, Russian, Irish, German, Brooklyn, and New Jersey as his dialect specialties (the first one happens [[EvilBrit to be the most common one]]).
** In a ''WebVideo/CriticalRole'' one-shot, Liam demonstrates one of his greatest party tricks: his pitch-perfect Speak & Spell imitation.
* PigeonholedVoiceActor: Most of his characters tend to be mentally unstable villains, but he still [[PlayingAgainstType plays against type]] from time to time.
* PlatonicLifePartners: He has a very close, [[LikeBrotherAndSister sibling-like friendship]] with Creator/LauraBailey, to the point where it's easy to mistake the pair for actual brother and sister. Liam even describes himself as the "president of the Laura Bailey fan club" and he clearly adores her with all his heart. They share a birthday, which is why they decided to play as twins in the first WebVideo/CriticalRole campagin.
* PlayingAgainstType:
** Dr. Tenma from ''Anime/{{Monster}}'', a NiceGuy TechnicalPacifist doctor. [[note]]The role of the villainous Johan Liebert went to Creator/KeithSilverstein instead, which was the StarMakingRole for him.[[/note]]
** Also both [[VideoGame/GuiltyGear Ky Kiske]] and [[VideoGame/SengokuBasara Tokugawa Ieyasu]], ReasonableAuthorityFigure type characters (quite a stark contrast to most of his characters). While he didn't reprise Ky for Xrd, he got landed with... Axl Low, a laid back friendly British guy, and Johnny, a suave playboy who's good hearted (also worth noting that this is a role he shares with Creator/NorioWakamoto, who's also pretty pigeonholed in playing evil villains, but [[PlayingAgainstType plays against type]] marvelously for this occasion)
** [[VideoGame/Persona3 Akihiko Sanada]] isn't exactly villain material either. VideoGame/{{Asura|sWrath}} [[ScreamingWarrior is a different story entirely]].
** And for a short time, he voiced [[VideoGame/TalesOfDestiny Stahn Aileron]], who's ''VideoGame/TalesSeries''' poster boy for WideEyedIdealist IdiotHero, and even moreso if you believe in his tendency to get cast as despicable villains in the series. There's also [[VideoGame/CastlevaniaPortraitOfRuin Jonathan Morris]], who while still good and powerful, isn't exactly the brightest bulb.
** Playing [[CasanovaWannabe Inigo]] from ''VideoGame/FireEmblemAwakening'', had him playing a suave, happy go lucky, overly emotional, ladies man who's just out to make everyone smile.
** He played [[KidHero Shobu]] [[{{Keet}} Kirifuda]] in the second and third seasons of ''Franchise/DuelMasters'', AND the young version of the aforementioned Tokugawa Ieyasu in the ''VideoGame/SengokuBasara Samurai Heroes'' anime. That's as far from his usual typecast as one can possibly get.
** Played around with Yasuo of ''VideoGame/LeagueOfLegends''. The promotional trailer paints him as a cold-blooded murderer, which may look a little in-line with O'Brien's type. When he's eventually released, it turns out Yasuo is an innocent man, trying to seek justice from being framed, and was a formerly arrogant Samurai that learned the arts of humility for real. [[BloodKnight Still got the eagerness to fight, though.]]
** He's played two German Marvel characters. One of them, completely in type, is the ComicBook/RedSkull. The other, ''Nightcrawler'', easily one of the nicest and kind hearted members of the X-Men.
** As Izana in ''VideoGame/FireEmblemFates'', he's a TotallyRadical {{Cloudcuckoolander}}, and his voice is a little higher than usual.
** Zazz, introduced in ''VideoGame/SonicLostWorld'', has a ''very'' raspy voice unlike his other roles.
* StarMakingRole: As Gaara from ''Naruto''.
* {{Villains}}: What he's best well-known for playing.
* WhatCouldHaveBeen: The ''VideoGame/CallOfDutyBlackOpsII'' E3 2012 demo had Liam voicing the player character, David Mason.
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->''"[[VideoGame/Persona3 Ha! Did you see that, Shinji!?]]"''\\
''"[[Videogame/Injustice2 You won't see anything, even your family, in a second.]]"''
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