[[folder:Swamp Thing]]
->'''AKA:''' "Alec Holland"
A plant mass that was born from the memories of Alec Holland. Initially believing himself to ''be'' Alec Holland, he eventually learned his real [[Main/{{Pun}} nature]].
* AnthropomorphicPersonification Of Nature.
* BadassBookworm: Well, Alec used to be a scientist, and he thought he was Alec for a long time. In a RunningGag, he's one of the few people who can always take ''ComicBook/{{Batman}}'' in a fight. 'Nuff said.
* BecomingTheMask: He isn't really Alec, just a plant elemental who assimilated Alec's memory and personality. While he eventually accepts this, the base of his personality is, for all intents and purposes, still Alec.
* BerserkButton: Don't touch Abby. Really, just don't. He turned all of Gotham into a jungle and beat the Batman to unconsciousness for keeping Abby in jail.
* BewareTheNiceOnes: Despite his monstrous appearance, he really isn't that bad of a person and can be amicable if he or his family aren't harmed or threatened. We still advise against pissing him off however, as he is capable of [[GaiaSVengeance plant-based rampages]] on par with [[ComicBook/{{Batman}} Poison Ivy's]], if not worse.
* TheBusCameBack: His resurrection and death are undone by the New 52, and while in the Green, the real Alec runs into Swamp Thing.
* CreepyGood: See HorrifyingHero.
* DeadAllAlong: He eventually found out this was true of Alec Holland.
* ElementalEmbodiment: He is an embodiment and representative of the Green, the cosmic force behind all plants.
* GaiasVengeance: He ''is'' Gaia's Vengeance, the representative of all living plant life.
* HorrifyingHero: He is a mass of plants assuming a vaguely humanoid form, several times taller than a regular human being and living in a Swamp. Still pretty much a good guy as long as you don't make him mad.
* InterspeciesRomance: With Abby.
* LightEmUp: Thanks to the whole ComicBook/BrightestDay shenigans.
* MidSeasonUpgrade: When he discovered he was a lot more than just "Alec Holland", Swampie quickly became more powerful up to PhysicalGod levels, able to manifest as long as there's any plant life around.
* NatureHero: He ''is'' nature, and probably the TropeCodifier of GaiasVengeance heroes.
* PhysicalGod: At the height of his powers.
* PlantPerson: Just look at the picture.
* SuperPowerLottery:
** BizarreAlienSenses: In the "vegetable sex" scene, Abigail temporarily experiences Swamp Thing's ability to sense life force, and perceives the wetlands as a shimmering field of glowing vegetation, dotted with bright life-sparks of animals.
** ElementalPowers
*** GreenThumb: Obviously, and he is a good contender for the strongest case of this power in the whole DCU to the point of being called a god. His control over plant life is strong enough that he can transform the entirety of Gotham into a jungle or create entire towns down to the last detail out of plant life alone.
** HealingFactor: UpToEleven; he can rebuild his body out of ''any'' mass of vegetation, even if it has been completely blown up. This borders on ResurrectiveImmortality.
** SuperStrength: His physical strength is just as impressive as his size would make you expect.
* TomatoInTheMirror: He was ''never'' Alec Holland. He's just a ghost in weeds.
* UnscrupulousHero: In later series, his only concerns are maintaining the stability of the Green and keeping his family safe. If either of those are threatened, especially the latter which he often expressed preference for over the former, the Swamp Thing will certainly kill in the most gruesome of ways as vengeance and will express no remorse over the fact.

[[folder:Swamp Thing II]]
->'''AKA''': Alec Holland
The ''real'' Alec Holland. Having died and moved on to the afterlife, he was eventually resurrected to serve as the new Swamp Thing.
* BackFromTheDead: He was resurrected to fight the corrupted Swamp Thing. In the New 52, he was brought back for some other reason.
* GhostMemory: He possesses Swamp Thing's memories, and at first he doesn't know why.
* LegacyCharacter: He serves as the second Swamp Thing after the plant elemental who used his name.
* ReplacementGoldfish: For Abby Arcane. She even says he's not "her" Swamp Thing when they first meet.
* RescueRomance: In the New 52, he falls in love with Abby after she rescues him.
* StarCrossedLovers: With Abby. Due to their roles as avatars of their respective elements, they ''cannot'' be together.

[[folder:Abby Arcane Holland]]
Swamp Thing's LoveInterest (later wife), and Dr Arcane's niece.
* BoyishShortHair: In the ''ComicBook/{{New 52}}''.
* DistaffCounterpart: [[spoiler:Of a sort to Swamp Thing as the Avatar of the Black.]]
* HappilyMarried: Eventually, to Swamp Thing. Ends up averted later on when Swamp Thing's dedication to the Green ends up being too much for Abby to tolerate in their marriage, and she decided to leave him and their daughter.
* InterspeciesRomance: With Swamp Thing. This was actually made a plotpoint once, as she was arrested for essentially marrying a plant. [[BewareTheNiceOnes Swamp Thing didn't react well]].
* [[MadScientistsBeautifulDaughter Mad Scientist's Beautiful Niece]]: To Arcane.
* MysticalWhiteHair: She is best-recognizable by her white and black hair.
** SkunkStripe: Inverted. She has white hair with a black stripe.
* PsychicPowers
** MindOverMatter
** {{Telepathy}}
* RescueRomance:
** She fell in love with Matthew after he (and the Swamp Thing) rescued her.
** She fell in love with Swamp Thing after he rescued her.
** With New 52 Alec Holland, ''she'' is the rescuer.
* SanitySlippage: Her marriage to Swamp Thing and trauma under Dr. Arcane has not done much to stabilize her mental state and is often seen in hysterics in stories when her personal life is threatened.

[[folder:Anton Arcane]]
Abby's uncle and Swamp Thing's ArchEnemy, Arcane is an EvilSorcerer MadScientist [[ImmortalitySeeker obsessed with gaining immortality]]. To this end, he has tried several times to get his hands on the Swamp Thing's body.
* AlliterativeName: '''A'''nton '''A'''rcane.
* AndIMustScream:
** [[spoiler:While in Hell, spiders lay eggs inside his body that hatch and eat their way out, causing him awful pain for eternity. To make things worse, the whole thing include a case of YearInsideHourOutside.]]
** Later, [[spoiler:The Parlment of Decay punishes his misuse of the Rot by trapping him a place of peace and life where death doesn't exist... which, considering his obsession with creating a place of endless death and decay, is torture to him.]]
* ArchEnemy: To Swamp Thing. He is by far the most persistant and personal antagonist.
* AxeCrazy: Could seriously rival SelfDemonstrating/TheJoker as one of the most depraved, homicidal villains in the DCU. His "accomplishment" include, among others, molesting his sister as a child, experimenting on his wife, practicing a lifestyle of necrophilia, cannibalism, depravity, and satanism that got him kicked out of school and once indirectly raping his own niece.
* BackFromTheDead: Death seems to be more of an inconvenience, really.
* BaldOfEvil: Usually despicted as bald, though there have been exceptions.
* BeenThereShapedHistory: Anton was the one who convinced Hitler to go into politics and start his campaign of terror and mass genocide, simply because he wanted more bodies to experiment on in order to find the secrets of immortality after he felt the last Great War ended too quickly and didn't provide him enough bodies for his liking.
* BigBad: By far the most prominent villain faced by the Swamp Thing.
* CainAndAbel: With his brother Gregori, Abigail's father, who "accidentally" stepped on a landmine, after which Anton experimented on him and turned him into [[FrankensteinsMonster the Patchwork Man.]]
* DemonicPossession: When he managed to escape Hell, he used this to interact with people, even possessing [[spoiler: Matt Cable]] for a time.
* DisproportionateRetribution: Completely ruined his niece's life and raped her by possessing her husband just because she turned down his request that she becomes his apprentice.
* EnfantTerrible: Even as a kid, he was a sociopath who took pleasure in hurting and molesting his younger sister. And he only got ''worse'' growing up.
* EvilSorcerer: Skilled in many forms of magic, including necromancy, among other things.
* EvilUncle: Doesn't even ''begins'' to describe his relationship with Abby.
* HeelFaceTurn: Though obviously, [[StatusQuoIsGod it didn't stick]].
* HorrifyingTheHorror: His apocalypse in ''Saga of Swamp Thing'' made ''the Joker'' stop laughing.
* ImmortalitySeeker: His main goal. Towards this end, he often plotted to steal Swamp Thing's indestructible body to inhabit and instigating the death of millions just to have more bodies to experiment on. Think Dr. Herbert West UpToEleven.
* JokerImmunity: As noted above, he has been killed an incredible number of times, but he ''always'' manages to come back and torment the Swamp Thing again even after being dead and sent to Hell.
* MadScientist: He is a brillant enough scientist to create synthetic organic matter, which he uses mostly to create monsters under his control or find ways to become immortal.
* MadeOfEvil: When Anton became an evil spirit and possessed Matt Cable, he was able to spread his evil influence across the country to the point even the Monitor, a cosmic being who oversaw the entire cosmos, was terrified of the evil Anton was giving off, even likening it to something on the level of Trigon the Terrible or the Spectre. The evil was so potent it started freaking out the afraid and deranged, and even managed to the make the '''Joker stop laughing''', rendering him a drooling and catatonic in the process. He's so bad the demons of Hell were impressed at how remorselessly evil he was after being sent there and allowed him to become a demon.
* {{Necromancer}}: [[spoiler:In the New 52, he became the avatar of the Rot, the force of Decay and Death.]]
* OneWingedAngel: Has at several times turned himself into various kind of hulking monsters through his experiments.
* RealityWarper: Used for horrific results when he [[spoiler: possessed Matt Cable]].
* SameCharacterButDifferent: By far one of the villains who has changed the most over the course of years, to the point it's difficult to find a picture appropriate for his page.
* SpiderPeople: In his third appearance, he became a cybernetic monstrosity, half spider, half zombie, with one compound eye piloting a aircraft shaped like a dragonfly.
* TakeOverTheWorld: Seemingly Anton Arcane's ultimate goal if not trying to be immortal. Later, he had the power to do so when he took possession of [[spoiler: Matt Cable's body and his reality warping abilities]]. And during [[spoiler: ''ComicBook/{{Rotworld}}'', we saw what the world would be like under Arcane's rule]].

[[folder:Floronic Man]]
->'''AKA:''' Jason Woodrue

* BreakoutVillain: He started out as a fairly minor villain from ''ComicBook/TheAtom''. Then Alan Moore used him for his own take on Swamp Thing, and he quickly got a boost in popularity.
* GaiasVengeance: Briefly attempts to do this after his contact with the Green, believing he is saving Earth from mankind by killing all non-plant life. Swamp Thing gets him out of it when he points out plants also ''need'' animals to survive.
* GoMadFromTheRevelation: He once managed to use Swamp Thing's body to contact the Green. The experience drove him insane, to the point that he tried to exterminate all non-plant life on Earth.
* HeelFaceRevolvingDoor: Briefly became a hero during ''ComicBook/TheNewGuardians'' series. He however reverted back to be a villain after the death of most of his teammates.
* OffWithHisHead: Happened to him in ''Batman: Shadow of the Bat''. Twice. [[GoodThingYouCanHeal Good thing he can heal]], indeed.
* PlantPerson
* RoguesGalleryTransplant: Originally a small-time baddie who bounced back and forth between Franchise/{{Batman}} and ComicBook/TheAtom. Considering [[BreakoutVillain what fighting Swamp Thing did to his popularity]], the change was for the best.
* StevenUlyssesPerHero: '''Wood''' '''rue'''. He actually invokes this himself when he tries to act as an agent of the Green.
* VillainousBreakdown: Has several in the space of a few issues.
* WasOnceAMan

[[folder:John Constantine]]
[[caption-width-right:288:John Constantine]]
A con-man who specialises in the occult. See [[ComicBook/{{Hellblazer}} his]] [[ComicBook/JohnConstantine pages]].
* AntiHero: He technically is a good guy, but [[AllergicToRoutine his motivations]] to do good are entirely selfish, and his methods tend to be morally ambiguous at best.
* BadassLongcoat: And a ''sentient'' one, at that.
* BreakoutCharacter: Ended up becoming so popular he eventually got his own series that lasted longer than Swamp Thing's, and his iconography became a part of pop culture too.
* JerkAss[=/=]JerkWithAHeartOfGold
* TheMentor: to Swamp Thing.
** TricksterMentor

[[folder:Matt Cable]]

Abby's first husband, a government agent.
* RealityWarper: Acquired these abilities from shock treatments designed to wipe his memory clean.
* DealWithTheDevil: [[spoiler: After fatally wounded in a car crash, Arcane in the guise of a fly convinces Mat to let "help" him survive. In reality, Arcane takes over his body and uses it to exact the most twisted revenge upon Abby and Swamp Thing.]]
* DeathEqualsRedemption
* DeathOfTheHypotenuse: [[spoiler: His coma and eventual death after the Arcane Saga free up Abby to openly enter a relationship with Swamp Thing guilt free.]]
* InspectorJavert: At first.
* {{Jerkass}}: During Alan Moore's run, Matt slides more and more into unlikable terrority, becoming colder and distant while abusing his powers to create pornographic fantasies for himself away from Abby. As such, the reader doesn't chide Abby for clearly developing romantic feelings more and more for Swamp Thing
* {{Transplant}}: He became Matthew the Raven in ''ComicBook/TheSandman''.

[[folder:The Parliament of Trees]]
* OmniscientCouncilOfVagueness

[[folder:The Patchwork Man]]
->'''AKA''': Gregori Arcane
* CainAndAbel: The Abel to Anton Arcane's Cain, only he didn't stay dead.
* FrankensteinsMonster

[[folder:Tefé Holland]]
[[caption-width-right:148:Tefé Holland]]

The daughter of Swamp Thing and Abby, conceived when Swamp Thing was using John Constantine's body.
* ExtraParentConception: As noted above, she was conveived by Swamp Thing using John Constantine's body to impregnate Abby.
* HalfHumanHybrid: half-human, half-elemental.
* MysticalWhiteHair: Just like her mother, only without the SkunkStripe.

[[folder:The Un-Men]]
* MixAndMatchCritters

[[folder:The Word]]