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!Doctor Horrible/Billy
->'''Played by:''' Creator/NeilPatrickHarris

-->''"The world is a '''mess''', and I just...need to rule it."''

* {{Adorkable}}: He can't talk to girls, he thinks that Captain Hammer and Penny are "probably going to French kiss or something" and is played by Creator/NeilPatrickHarris.
%%* AffablyEvil
* AntiVillain: Has shades of WoobieDestroyerOfWorlds and WellIntentionedExtremist. Loses the latter by the end.
%%* BadassBookworm
* BewareTheNiceOnes: He has genuinely good intentions [[WellIntentionedExtremist for both the world]] and [[DoggedNiceGuy in his friendship with Penny]], but ends up being pushed far enough by Captain Hammer for him to [[spoiler: try to]] break his rule of ThouShaltNotKill.
* CannotTalkToWomen: Or at least to Penny, mostly because of how painfully, painfully shy he is.
* CardCarryingVillain: His alias as well as his slogan ("I have a PhD in horribleness") are an admition of his villainy.
* ClarkKenting: Dr. Horrible's outfit is Billy in a labcoat and goggles. Backfires on him [[spoiler: when Captain Hammer recognizes Billy at first glance.]]
* DeadpanSnarker: "Wow, sarcasm. That's original."
* EvenEvilHasStandards: He refuses to commit murder [[spoiler:until Captain Hammer boasts that he will sleep with Penny just to spite him.]]
* EverythingButTheGirl: [[spoiler:Billy gets money, fame and acceptance into the Evil League of Evil but only because the girl he loves dies.]]
* EvilCostumeSwitch: In act I, when he changes in his Dr. Horrible outfit. [[spoiler: And at the end of act III, when he dons his new {{red and black|And Evil All Over}} costume.]]
* EvilLaugh: He has a voice coach for it. By act III, he's finally got it.
* FromNobodyToNightmare: Goes from WellIntentionedExtremist to full on villain. See NotSoHarmlessVillain for more.
* GogglesDoNothing: He wears a pair, but they don't seem to serve any sort of purpose other than [[RuleOfCool looking cool]].
* HeroWorshipper: {{Inverted|Trope}}. He evidently has deep admiration for Bad Horse, which Penny finds disturbing when he accidentally mentions it.
* IneffectualSympatheticVillain: [[spoiler:Until the end, when he joins the Evil League of Evil.]]
* JumpingOffTheSlipperySlope: Or SlowlySlippingIntoEvil in this case over the course of the musical.
* KnightOfCerebus: Becomes one by the end of the musical. He even lampshades this.
---> And now the nightmare's real/Now Dr. Horrible is here/To make you quake with fear/[[KneelBeforeZod To make the whole world kneel]]/And I won't feel...[[DespairEventHorizon A thing.]]
* LonelyAtTheTop: [[spoiler: He succeeds in his ambition to join the Evil League of Evil but looses the girl he loves in the process.]]
* LooseLips: Turns out Captain Hammer and the LAPD are among his listeners.
* LoveMakesYouEvil: In a strange sort of way because Penny was also his MoralityPet. [[spoiler:When she died, so did his conscience.]]
* MadScientist: Deconstructed somewhat, but ultimately played straight in the end.
* MorallyAmbiguousDoctorate: He has a [=PhD=] in horribleness!
* NeverHurtAnInnocent: At first at least. That is, until he joins the Evil League of Evil in the end.
%%* NobleDemon: [[spoiler: At least until the end.]]
%%* NoRespectGuy
* NotSoHarmlessVillain: Pretty much. He goes from IneffectualSympatheticVillain to full on threat in the end.
* ProtagonistJourneyToVillain: He has one foot in villain territory in the beginning. Captain Hammer certainly doesn't help things though.
* PsychoticSmirk: When he starts singing ''Brand New Day''.
* SanitySlippage: Due to the inability to deal with the fact that he girl he's in love with is involved with his nemesis.
* ShooTheDog: Tries to get Penny to evacuate the room when he has Hammer frozen and everyone else cowering in fear, as he does not want her see him doing this. Tragically ineffective, and she can only watch in fear, and ends up getting killed when the Death Ray explodes.
* ShrinkingViolet: He's shy and unable to talk to the girl he likes until she talks to him first and even then he's visibly nervous
* StalkerWithACrush: To Penny.
%%* StepfordSmiler: [[spoiler: After Penny dies.]]
%%* SympatheticPOV
%%* TenorBoy
* TechnicalPacifist: Personally against murder, which he sees as beneath him--or at least, would like to. It seems to be implied that the ''real'' reason he won't kill is because he knows it's wrong, but he doesn't wanna admit that, so makes up an excuse about it not being "elegant or creative" enough.
* TragicVillain: [[spoiler: After Penny's death.]]
%%* TwitchyEye
* VillainProtagonist: Though he begins the musical as the DesignatedVillain at worst [[spoiler:he goes an emotional downhill that leads to him embracing villainy by the end.]]
* VillainSong: Three memorable ones. [[https://www.youtube.com/watch?v=hjK387DVX7I Brand New Day]], [[https://www.youtube.com/watch?v=emTppaeqt9U Slipping]] and [[https://www.youtube.com/watch?v=4Pk5LSZ9EyI Everything You Ever]].
* WellIntentionedExtremist : He's vague on the specifics, but he clearly thinks that the world would be a better place with him in control.
* WhatTheHellHero: He calls out Captain Hammer for pushing Penny out of the van's way and into some trash.
* WhosLaughingNow: In his penultimate number, when he freezes Hammer and has everyone cowering in fear.
* WoobieDestroyerOfWorlds: [[spoiler:By the end of the musical.]]

!Captain Hammer
->'''Played by:''' Creator/NathanFillion

-->''"Everyone's a hero in their own way/You and you, and mostly me, and you."''

%%* AntiHero
%%* BadassBaritone
* BigBad: People think of him as a hero, but he screws with Doctor Horrible for the hell of it which forms the conflict.
* BitchInSheepsClothing: Despite being a self-proclaimed hero, he's quite the jerk.
* BreakTheHaughty: [[spoiler:In the end, when he is injured by the Death Ray explosion and is seen crying to a psychologist in the closing scenes.]]
* CaptainSuperhero: It's in his name.
* ChestInsignia: Of a hammer.
* CivvieSpandex: His superhero outfit is mostly just normal articles of clothing.
* CloudCuckoolander: Even in a cast like this, Captain Hammer says... ''strange'' things sometimes.
* CorporateSponsoredSuperhero: Or corporate tool, if you ask Dr. Horrible.
* CreateYourOwnVillain: If he hadn't been so convinced that all nerdy kids are potential supervillians, he probably wouldn't have to worry about Dr. Horrible.
* DirtyCoward: He's only brave when his powers keep him from being harmed by conventional means. [[spoiler:The moment he actually experiences physical pain he ''immediately'' flees in panicked tears.]]
* DropTheHammer: Averted; despite having the word "hammer" in his name, he's never actually seen using one as a weapon.
* DumbIsGood: Utterly deconstructed. Advocates anti-intellectualism, telling kids that any kid who's either a nerd or "different" in some ways is a potential supervillain who must be put behind bars. Needless to say, he's a thoughtless jerk who barely even registers on the side of good, and does even more damage with his aforementioned approach by making a monster out of what may have been a non-threat.
* DumbMuscle: Downplayed in that he's smart enough to follow Dr. Horrible's Blog and [[spoiler:immediately realizes that Billy is Dr. Horrible.]]
%%* FakeUltimateHero
* FeelNoPain: Implied when [[spoiler:the malfunctioning death ray exploding in his hands causes him pain, or rather, "I think this is what 'pain' feels like!"]]. Apparently, he had never felt pain before.
* GoodIsNotNice: Deconstructed. He's a petty, bullying, anti-intellectual, womanizing smug jerk. He also saves the city from super-villains on a regular basis, but only for the PR, and is completely unconscientious about the safety of its citizens, judging from his "save" of Penny.
* HandsomeLech: He's quite the womanizer.
* HaveIMentionedIAmSexuallyActiveToday: "So I thank my girlfriend Penny (yeah, we totally had sex)/She showed me there's so many/Different muscles I can flex..."
%%* HeroAntagonist
%%* HeteronormativeCrusader
* IWantMyMommy: "Mama! Someone maternal!"
* ItsAllAboutMe: The main reason he loves being a superhero is the limelight. Even in his final number "Everyone's A Hero" he sounds utterly narcissistic.
* JerkWithAHeartOfJerk: Penny thinks Captain Hammer is really sweet on the inside, despite being [[TheAce a bit full of himself]]. The truth is Captain Hammer is only being nice to Penny to get in her pants and ''simultaneously'' piss off the eponymous character. Lampshaded when Penny states that he must have a deeper layer that's totally different from the one on the surface, Bily replies that he sometimes there's a third, even deeper level, and that one's exactly the same as the top surface level -- like pie.
* KickTheDog: He dates and sleeps with Penny just to spite Billy.
* KnightTemplar: Full of himself, nonetheless.
* MeaningfulName: [[spoiler:The hammer is his penis.]]
* MilesGloriosus: He's only brave and bold because he's invulnerable to damage. The first time he gets hurt, he literally runs screaming like a little girl and spends months in therapy over it.
* NeatFreak: Why he constantly wears gloves. Pay attention to him during the "My Eyes" song and it becomes clear he's hiding it from Penny. Possibly just an extension of his superiority issues over everyone else.
* NighInvulnerability: He only gets injured in the end, from the Death Ray explosion.
* NonIndicativeName: For a guy named Captain Hammer, he's never once seen wielding a hammer.
%%* NotSoInvincibleAfterAll
* PoliticallyIncorrectVillain:
** "I hate the homeless...[[LastSecondWordSwap ness problem]] that plagues our city."
** "Don't worry if it's hard./If you're not a friggin' 'tard you will prevail!"
* {{Pride}}
* ReallyGetsAround: Has never slept with the same woman twice.
* ScienceIsBad: In the spinoff comic, he demands that children report nerds to the police.
* SmugSuper: His ego's just a ''bit'' too big for his own good.
* StealthPun: It's the reason for his superhero name, [[spoiler: considering hammers bang stuff (well, people in his case)]].
%%* VillainWithGoodPublicity

->'''Played by:''' Creator/FeliciaDay

-->''"Even in the darkness/Every color can be found..."''

* DiesWideOpen: [[spoiler:Her final fate.]]
%%* HeroesWantRedheads
* HorribleJudgeOfCharacter: Fails to see the problems with Hammer as a person. She does catch on, just a little too slowly.
* TheIngenue: And how. She's good-hearted but horribly naive. She does realize what a tool, pun intended, Hammer is, but a little too late.
* KillTheCutie: [[spoiler:Her ultimate fate. Of course, given that it's a Joss Whedon production, many author-savvy viewers saw it coming.]]
%%* LoveMartyr
* MeaningfulName: Lots of possibilities. It could refer to her charity and optimism, her being something under valued or unimportant, or [[spoiler:a payment for what Doctor Horrible wants in life.]]
* MoralityChain: For Dr. Horrible. [[spoiler:Her death is the final catalyst for his transition into villainy.]]
* NiceGirl: Her defining trait. The one unambiguously good character in the musical.
* NotListeningToMeAreYou: Her speech to Billy in act I trails off into "...so they can buy rocket packs and go to the moon... and become florists" when she sees that he's not paying any attention.
* ParentalAbandonment: Implied in her prequel comic.
* StoodUp: She waits for Billy in act III with frozen yogurt, but he was busy plotting Captain Hammer's murder.
* TooGoodForThisSinfulEarth: [[spoiler:Penny is the nicest person in the story, and unwittingly causing her tragic death is what sends Billy spiraling into true villainy.]]
* TrashLanding: Shoved into the trash by Hammer by his save.

->'''Played by:''' Simon Helberg

-->''"Look at me, man. I'm Moist. At my most badass, I make people feel like they want to take a shower."''

* AntiVillain: To some extent, though he seems to have less of a problem than Billy when it comes to killing someone.
* TheDragon: To the good doctor himself, sorta.
* BlessedWithSuck: His "Power" is merely that he's perpetually moist.
* IneffectualSympatheticVillain: Played with, given that his boss is actually ''worse'' at the whole evil gig.
* MisappliedPhlebotinum: His condition is due to a plutonium-powered air moistener that his father got to fix his dry skin.
* PowerIncontinence: Can't control his moisture.
* WhatKindOfLamePowerIsHeartAnyway: The power of moistening is... not the greatest.
* WeirdTradeUnion: The Henchman's union.

!Bad Horse
->'''Played by:''' Dobber

-->''"[[YouHaveFailedMe There will be blood, it might be yours]]\\
So go kill someone\\
Signed, Bad Horse"''

* AnimalSuperheroes: {{Inverted}}: he is a horse, and he's evil.
* AnimalThemedSuperbeing: Until the reveal that... he really ''is'' a horse.
%%* CoolHorse
* TheDreaded: Bad Horse inspires equal parts dread and awe from other villains. And only the former from everyone else.
* TheDon: Based on his letters, he's this to the Evil League of Evil.
* EvilLaugh: His terrible death whinny. It apparently set the standard for evil laughs.
* ExactlyWhatItSaysOnTheTin: He's a horse, and he's bad.
* GreaterScopeVillain: Technically the BigBad of the show is Billy himself, with Captain Hammer as the HeroAntagonist, but Bad Horse has a greater presence in the setting as a whole. He leads the Evil League of Evil and is the one who pushes Billy towards evil, ordering him to commit murder in order to gain entrance to the League.
%%* HellishHorse
%%* LivingLegend
* RedBaron: ''The Thoroughbred Of Sin''
* SmallRoleBigImpact: Though he only has a seconds-long cameo at the very end of the video, Bad Horse's high standards for joining the Evil League of Evil is what drives Dr. Horrible to build his freeze ray and set off the plot.
%%* SuperheroSobriquets
* TheUnintelligible: Subverted. Speaks only in horse sounds for most of the ELE comic, with Jefferson claiming that Bad Horse was appointing him "vice president." Subverted at the very end when Bad Horse speaks English.

![[DepartmentOfRedundancyDepartment Evil League of Evil]] leaders

* '''Professor Normal''': A cyborg with a super strong robotic arm and jaw attachment. Otherwise, he's a normal person with a wife, kids, and a mortgage, hence his name.
* '''Tie-Die''': A hippie-themed supervillainess able to make hippies violent and angry.
* '''Dead Bowie''': A Music/DavidBowie-inspired supervillain with the power of persuasion. Claims to be the real David Bowie who was murdered in 1980 and that every other appearance by Bowie afterward was an impostor.
* '''Fury Leika''': Her name is a [[PunnyName pun]] off of "Hell hath no fury like a WomanScorned." She was left at the altar and then pooped on by a radioactive dove. She gained poisonous flowers, incendiary rice, a ball and chain around her ankle, and four henchwomen each carrying something old, something new, something borrowed, and something blue.
* '''Fake UsefulNotes/ThomasJefferson''': Claims to be the real Thomas Jefferson, though that is unlikely unless Jefferson had SuperStrength. Also carries a quill pen tipped with tranquilizer. Doesn't like to have lots of stuff in his pockets.
* '''Snake Bite''': A supervillainess with a cobra-themed costume. Carries a staff topped by a mini disco ball. Did not appear in the "Evil League of Evil" comic with the other ELE leaders.

!Minor villains
* '''Hourglass''': A villainess who is able to see the future. Tells Moist about a kid who will become President. An [[TheGhost unseen character]].
* '''Bait and Switch''': A pair of villains who Moist goes on a double date with. Somehow able to fool him into thinking he was dating [[PunnyName Bait instead of Switch]]. Bait is apparently the more attractive of the two.
* '''Conflict Diamond''': A villain friend of Dr. Horrible and Moist. Went on the double date with Moist, Bait, and Switch.
* '''Pink Pummeler''': A [[ArmoredClosetGay homophobic villain]] with SuperStrength, {{Gaydar}}, and a superhuman knowledge of Broadway show tunes. Repeatedly rejected by the ELE due to his tendency to date rather than beat up his victims.
* '''Purple Pimp''': A supervillain who appears at the party for Dr. Horrible's induction into the ELE.

!Minor heroes
* '''Johnny Snow''': An amateur hero not affiliated with the Council of Champions. He wears a parka and carries an [[AnIcePerson Ice Beam]]. He's mentioned in Act I and appears in the ELE comics, where he foils a plot by the ELE to poison the city's water supply by [[NiceJobBreakingItHero freezing it]]. The villains are [[YourApprovalFillsMeWithShame impressed]] and mistake him for a supervillain.
* '''James Flames''': A potbellied superhero with [[PlayingWithFire pyrokinetic]] powers. His CatchPhrase is "M'name's James and I have the power of flames." Wears a singed T-shirt and pink overalls. He thaws the water supply after Johnny Snow freezes it.
* '''Wingspan''': A member of the Council of Champions, along with Captain Hammer. Works in a command center in the sky. He, along with the rest of the Council, foolishly leaves the city for a retreat, allowing the ELE to wreak havoc. Appears briefly in the ELE comic.
* '''Elementia''': A blue-skinned superheroine and a member of the Council of Champions. Works in a command center with a waterfall and apparently has some kind of ElementalPowers. Has no problem sitting naked in a sauna with men.
* '''???''': An unnamed member of the Council of Champions with a third eye in the middle of his forehead. He appears in the sauna with the rest in the ELE comic.