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* ''Webcomic/{{Unsounded}}'': As Sette develops over the course of the story her eyes start flashing red when she gets upset. They stay red in the final chapter when she's prevented from saving a toddler and discovers she can [[spoiler: control Duane, calling their entire relationship]] and her humanity into question. She then turns her claws on one of her closest companions knowing she will likely kill them and destroy their memories.
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* ''Webcomic/VampireGirl'': The three villains of the second season are all in possession of red eyes, and while Saul and Paul merely have red irises, [[BigBad The Vampiress]] has [[GlowingEyesOfDoom solid red eyes that glow]].
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* Zig-zagged in ''Webcomic/KillSixBillionDemons'': red eyes aren't uncommon in the AmazingTechnicolorPopulation, but they do show up on some of the most dangerous people in Creation: GodEmperor Zoss and OneManArmy Maya.
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* Zig-zagged in ''Webcomic/KillSixBillionDemons'': red Red eyes aren't uncommon in the AmazingTechnicolorPopulation, AmazingTechnicolorPopulation of the multiverse, but they do show up on some of the most dangerous people in Creation: GodEmperor Creation. [[TheMentor Zoss the Old King]] has red eyes and OneManArmy Maya.is, at best, [[OmniscientMoralityLicense very morally ambiguous]]. Maya and Incubus both have reddish eyes (Maya's are red-brown, and can look like either; Incubus' are pink due to his albinism) and are incredibly dangerous swordsmen. Finally, Jagganoth has red-coloured GlowingEyesOfDoom, and is an OmnicidalManiac and the WorldsStrongestMan.
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* In ''Webcomic/{{Adventurers}}'', Khrima has solid red eyes. It's an impressive feat of comic-villainy that this makes him look more silly than intimidating.
* Hartwig from ''Webcomic/AshfacesDaughter'' has his eyes turn completely red whenever his true berserker curse activates.
* In ''Webcomic/{{Archipelago}}'', when someone [[DealWithTheDevil enters the service of the Great Raven,]] their left eye becomes black with a red pupil.
* In ''Webcomic/AverageJoe'', Fatale's eyes go from white, to glowing red behind her mask when angered. [[http://ajcomic.com/?p=152 This]] [[http://ajcomic.com/?p=470 happens]] [[http://ajcomic.com/?p=665 a lot]].
* ''Webcomic/BobAndGeorge'': Helmeted Author has red eyes. This is one of the two things that make him different from [[AuthorAvatar the real Author]] - [[ExactlyWhatItSaysOnTheTin the other one is the obvious]].
* Webcomic/TheBongcheonDongGhost has red eyes, but by the time you see them, it's already very obvious...and too late.
* Early on in ''Webcomic/ChasingTheSunset'', whenever Leaf's eyes go red, it means he's about to unleash the Furies. Not sure if it persists later.
* In ''Webcomic/ComicShorts'', Leko the Robot's normally green eyes turn red when he gets very angry.
* Combined with HellishPupils in ''Webcomic/CommanderKitty'', when [[BigBad Zenith]] [[http://www.commanderkitty.com/2010/07/25/whose-side-are-you-on/ ends up running into Nin Wah again]]. [[spoiler: Inverted after she breaks down and is turned back on sans personality, [[http://www.commanderkitty.com/2012/10/27/not-making-it-easy/ where her red pupils instead seem to signify her being at her most docile and obedient]].]]
* Played for laughs in ''Webcomic/CtrlAltDel'', usually, one example being when Buckley got ''VideoGame/StreetFighterIV'' and grew increasingly frustrated over [[TheComputerIsACheatingBastard the computer AI being cheap]].
-->'''Buckley''': God ''damn it, c.viper''! I swear I am going to [[CutHisHeartOutWithASpoon face-fuck you with a dump truck]]!
* ''Webcomic/CursedPrincessClub'':
** Humorously subverted when Gwendolyn and her arranged fiancé Frederick [[https://www.webtoons.com/en/comedy/cursed-princess-club/ep-25-confrontation/viewer?title_no=1537&episode_no=25 meet a second time]]. Gwen already has a FaceOfAThug that had previously made Frederick resistant to marrying her. And right before this second meeting, he thought he had just killed Gwen by accident[[labelnote:note]]It was actually cursed princess Monika. She was wearing a dress of Gwen's that she stole, and when Frederick saw her from behind he thought it was Gwen. Also, Monika turned into a crow out of Frederick's sight after she fell off the cliff, so she didn't die either.[[/labelnote]] Gwendolyn had earlier heard Syrah give a hypothetical speech for her to use with Frederick to try and reconcile with him. As she tries to remember what exactly Syrah said, she's also TryingNotToCry because she's unused to being so confrontational; the strain of this leaves her eyes increasingly bloodshot, making it look like she has a furious, red-eyed DeathGlare. Combined with her misremembering the lines in a way that sounds like she's unkillable and vengeful against Frederick, this leaves him utterly terrified.
** Played straight with King Leland of the Plaid Kingdom, who has naturally red irises and is very strict with his sons to the point of occasionally being downright [[AbusiveParents abusive]] (especially with [[TheUnFavourite Frederick]]), on top of having a rather Machiavellian approach to ruling in general.
* ''Webcomic/DanAndMabsFurryAdventures'': Aaryanna, Aniz, Dark Pegasus, Kria, and Regina all have red eyes, and are all pretty evil to varying degrees ({{Villainy Discretion Shot}}s notwithstanding).
* The "tainted" or Ver'drowendar from ''Webcomic/{{Drowtales}}'' have red irises; they "have been seeded by a demonic entity". All drow naturally have red pupils, but this is the result of [[http://en.wikipedia.org/wiki/Tapetum_lucidum eyeshine]] and is an evolutionary adaptation to living underground, but results in tainted characters having red on red eyes.
* In ''Webcomic/ElGoonishShive'', the first time Grace is seen to shapeshift [[http://www.egscomics.com/?date=2002-03-10 her eyes go red during the transformation]]. This was dropped during all subsequent transformations.
* In ''Webcomic/{{Endstone}}'', rocking the [[ArtifactOfDoom Banestone]] [[http://endstone.net/2011/06/23/6-04/ gives Jon red eyes.]]
* Parson from ''Webcomic/{{Erfworld}}'' gains red eyes after completing his sword, in a panel that makes him look genuinely frightening for the first time in the series.
* Played with in the ''Webcomic/{{Erstwhile}}'' adaption of "Sweetheart Roland", where red indicates MindControlEyes.
* ''Webcomic/FakeNewsRumble'' subverts this, as Stephen has red eyes (because of [[spoiler:the phoenix'power]]), and [[SubvertedTrope he's one of the protagonists]] [[spoiler:[[MindRape as]] [[DemonicPossession long]] [[FaceMonsterTurn as his]] [[BrainwashedAndCrazy eyes]] [[GlowingEyesofDoom stay]] [[MindControlEyes red]]]], that is.
* ''Webcomic/TheFoxSister'': The [[AsianFoxSpirit Kumiho]] loves this one.
* In ''Webcomic/{{Freefall}}'', [[http://freefall.purrsia.com/ff1400/fc01335.htm a vengeance-minded robot has glowing red eyes for a moment.]]
* ''Website/GaiaOnline'':
** Johnny K. Gambino.
** And, ironically, his opposite number, Vladimir Von Helson, via heterochromias (one gray as is standard for [[OurVampiresAreDifferent Gaian vampires]], one red apparently just for the sake of this trope).
* ''Webcomic/GirlGenius'': while subtle, it is seen well [[http://www.girlgeniusonline.com/comic.php?date=20120102 in this strip]] that Mama Gkika has red eyes. Possibly other Jägers, too.
* Inverted in ''Webcomic/TheGlassScientists'', as it's the calm Jekyll who has red eyes, while more dangerous Hyde's are green.
* Marceline from ''Webcomic/GodMode'' is described as a "[[http://godmodeonline.com/d/20051205.html sado-masochistic chain-smoking woman]]". Which is more or less true.
* ''Webcomic/{{Godslave}}'':
** Anpu's eyes start glowing red just before he delivers an impressive LightEmUp flashbang to Turner.
** Edith's eyes start to glow red whenever she uses her powers extensively.
* ''Webcomic/GunnerkriggCourt'':
** The yellow salamander/lizard-thing. It may not have been evil, per se, but it was certainly dangerous. [[spoiler: The lizard was a house fire that killed a small child and his family.]]
** Zimmy plays an odd variation of the trope. Normally she seems to have BlackEyesOfEvil, but when she is temporarily purified from the etheric miasma that pollutes her spirit by natural rain, it turns out that [[http://www.gunnerkrigg.com/?p=196 her eyes are bright crimson underneath]]. In this condition she is a lot more coherent and amiable than her usual self, but acts as a reminder that she's not exactly normal, either way.
** Hetty has red eyes and is as evil as they imply, as seen from her suggestion that Reynardine kill Antimony and her IrrationalHatred toward Adam.
** The Court robots generally have green eyes, but they'll turn yellow when the robot is alarmed by something and red when they have detected certain kinds of threats. Although they're never evil, when in red-eye mode they do not respond to normal commands and will use violent force against the perceived danger without further warning.
* All the vampires in ''Webcomic/HannaIsNotABoysName'' have red or reddish eyes, although some are more evil than others and the least evil of the four we've seen so far isn't drawn with visible irises at all.
* Panim, the MisanthropeSupreme from ''Webcomic/HelloWorld''.
* ''Webcomic/{{Homestuck}}'' has Calliborn, having candy-red eyes and red swirls on his cheeks [[spoiler: that turn into solid circles once he successfully kills Calliope]]. His eyes are no long red, but no less eerie, [[spoiler: when he transforms into [[BigBad Lord English]] and his eyes turn into constantly cycling pool balls.]]
* ''Webcomic/ImTheGrimReaper'': One of Scarlet's eyes tends to glow when she summons her scythe. Her irises are always bright red.
* In ''Webcomic/ImpureBlood'', [[https://web.archive.org/web/20110616190510/http://impurebloodwebcomic.com/Pages/Issue4PAGES/ib082.html when annoyed]]. Note that her eyes can also glow blue for other magical purposes.
* ''Webcomic/{{Kagerou}}'': when (the aptly-named) Red takes over Kano's body, his eyes turn red. And Red is a psychopathic rapist and murderer.
* Zig-zagged in ''Webcomic/KillSixBillionDemons'': red eyes aren't uncommon in the AmazingTechnicolorPopulation, but they do show up on some of the most dangerous people in Creation: GodEmperor Zoss and OneManArmy Maya.
* Quite a few characters from ''Webcomic/LsEmpire'' (most notably [[spoiler:Dark Star]]). Pix averts this as, despite him always having red eyes [[spoiler: due to being Dark Star's son]], he's [[IncorruptiblePurePureness the nicest guy in existence]].
* In ''Webcomic/LookingForGroup'', most characters, regardless of whether they are evil or good, will display the "burst of anger" or bloodlust variant. Bloodrages will most prominently display it before dishing out punishment, but even NiceGuy Cale will display them in bouts of righteous anger.
* Valentino, the BigBad of ''Webcomic/{{Marilith}}'', has red eyes. The effect is highlighted by the rest of the strip being mostly in black and white.
* Otherworlders in ''Webcomic/{{Miamaska}}'' have red eyes and purple sclera. Citizens see this as a threat to their town and [[http://miamaska.tidalcomics.com/index.php?strip_id=49 take action accordingly]].
* ''Webcomic/{{Noblesse}}'': One of the major factions in the story is [[OurVampiresAreDifferent the nobles of Lukedonia]], all of whom, including the protagonist Rai, have red eyes.
* ''Webcomic/TheOrderOfTheStick'':
** Sabine's eyes glow red in her true form. There is an early warning of her true nature in [[http://www.giantitp.com/comics/oots0053.html this strip]], which is before she's revealed to be a fiend. Later, the glowing-red eyes are a [[http://www.giantitp.com/comics/oots0356.html hint for the reader]] that she's shapechanged.
** Xykon has [[GlowingEyelightsOfUndeath glowing red eyes]] too.
** Also, [[http://www.giantitp.com/comics/oots0079.html Loki]], god of Flames and Chaos.
** [[spoiler: Malack's]] eyes change to red from their usual [[spoiler: pink]] when using his vampiric abilities.
* ''Webcomic/PennyArcade'':
** Tycho gets these whenever he gets particularly angry or is acting particularly evil, apparently because his body harbors a dark spectre from the world of dreams.
** ''Webcomic/PennyArcade'' sub-comic ''Automata''. There's something in that time signature and it changes the eyes from the standard blue to...[[http://www.penny-arcade.com/comic/2009/8/3/ help.]]
* In ''{{Webcomic/Phantomarine}}'', Cheth's eyes turn red when he is experiencing [[https://www.phantomarine.com/comic/444-special-delivery extreme emotions]].
* ''Webcomic/RescuingDara'' [[AvertedTrope averts]] this trope, with the hero Chivai and both the heroic and villainous Lucarios all having red eyes.
* In ''Webcomic/{{Roza}}'', [[https://web.archive.org/web/20090210011326/http://www.junglestudio.com/roza/?date=2007-05-23 the monstrous guard]].
* Subverted in ''Webcomic/RustyAndCo'' by a [[TheBrute hulking]], red-eyed mercenary from a [[BeastMan gnoll]] tribe: cousin Slobber, the friendly pug who [[http://rustyandco.com/comic/level-7-77/ loves cotton candy]] and happily pulls a MookFaceTurn when his old boss takes a dive into lava.
* While this is not common due to the art style of ''Webcomic/ScandinaviaAndTheWorld'', it does occasionally show up, generally when either [[http://satwcomic.com/dysfunctional-family Åland]] or [[http://satwcomic.com/smalltalk Finland]] are especially upset.
* ''Webcomic/SlightlyDamned'': Subverted with [[ThePollyanna Buwaro]] [[note]] At least when he isn't [[spoiler:''completely'' [[SuperpoweredEvilSide berserk]]]] [[/note]] or [[DefectingForLove Lakritz]] who are both among the kinder demons around, however red seems to be one of the most common demon eye colors and most of them play it straight. The most notable of these demons is [[spoiler:Iratu]] who at first seems to be friendly but [[InVinoVeritas that's]] because he was drunk and when we see him sober we learn he is a cunning and powerful General of [[TheLegionsOfHell Hell's Army]] who [[spoiler:leads an attack on a major city that kills hundreds if not thousands of innocent people]].
* ''Webcomic/SluggyFreelance'':
** In one story, Bun-bun the evil mini-lop rabbit is stuck with the annoying animated shadow of the groundhog who's the AnthropomorphicPersonification of Groundhog's Day. Unable to attack the insubstantial creature, he's forced to suffer all its antics. But finally it manages to do something that angers Bun-bun so much that he finally snaps. He gets ''so'' angry his eyes turn red, and subsequently he emits a red aura. Insofar as there is an explanation to this, it could be that [[spoiler: by that time Bun-bun was already a mildly supernatural being due to being saddled with being the Easter Bunny as well as the official "groundhog"]].
--->'''Shadow''': What do you want to do?\\
'''Kiki the ferret''': I have a pretend karaoke machine made from a toilet-paper roll!\\
'''Shadow''': You like karaoke too?\\
'''Kiki''': I LOVE karaoke!\\
'''Shadow''': A one and a two and a\\
'''Bun-bun''': '''''That's IT! Everybody dies!'''''
** In "Anima: Culmination", Troloria, a psionicist with godlike powers, normally has blue GlowingEyes. Whens he gets really angry, she gets first red dots in the middle of them and then wholly red glowing eyes.
* Eli of ''Webcomic/SoulToCall'' has red, sometimes glowing eyes. While the population at large, especially [[ChurchMilitant The Order]] believes that he is dangerous, the fact is, that he is actually very meek, and shy. The red eyes glowing means that ''something else'' has just shown up, and '''that''' is what's actually dangerous.
* Dr. Schtein of ''Webcomic/StringTheory2009'' has prosthetic eyes that glow a sinister red, having lost his original eyes in a lab explosion. Thus far, they seem to be foreshadowing his eventual rise to supervillainy. They even glow in the dark, much to the horror of his prison roommate.
* Darko, the mercenary from ''Webcomic/TheStupiders'' has glowing red eyes: ''[[http://www.stupiders.com/comic.php]]''.
* In ''Webcomic/SurvivingRomance'' it's one of the signs of someone having become a zombie.
* ''Webcomic/{{Terra}}'' has Sovereign Northazul Kalar, EvilOverlord of an empire trying to conquer the galaxy, and his son Solus Kalar, head of a NebulousCriminalConspiracy that started out as a private army for Northazul.
* ''Webcomic/TowerOfGod'':
** Ha Yuri Jahad just lives and breathes this trope, especially when she gets serious.
** Pedro the "Death Eye" has piercing red machine-like eyes that are his most distinguishing feature. [[ObviouslyEvil He just so happens to also be]] [[DragonWithAnAgenda Karaka's]] [[ObviouslyEvil underling]].
* Subverted in ''Webcomic/TwoGuysAndGuy'': Wayne thinks [[http://www.twogag.com/archives/2204 Guy's eyes glow red in the dark]] ''because'' she's evil. [[spoiler: The optometrist is pretty upset Wayne didn't mention it sooner, implying it's not only unnatural but also dangerous.]]
* ''Webcomic/{{Underling}}'': [[https://web.archive.org/web/20100619071344/http://underlingcomic.com/page-seventy-five/ Demons.]] This is awkward for Lazarus when he gets them, and a tail, and horns.
* ''Webcomic/{{Waterworks}}'': Flush gains a set of red eyes just before he uses his deadly SpinAttack. [[http://mspfanventures.com/?s=43&p=238 "oh hey flush. you're sporting the evil red eye look rather nicely"]]
* ''Webcomic/WeakHero'':
** A variation in that Forrest constantly seems to have bloodshot eyes, meaning that it's his sclera that look red while he goes around violently beating people up.
** Robin has narrow eyes with small red irises, and is a BloodKnight that thirsts to take on anyone in a brawl.
** When Wolf is shown proof that Rowan was the one who took his prized bag, an aura flares about him and his eyes go bloodshot in rage. Jared compares it to a rabid dog being given meat.
** [[InvincibleVillain Donald]] is one of the nastiest characters in the story, and his blood-red eyes combined with paper-white skin give him the appearance of a vampire.
* In ''Webcomic/YokokasQuest'', Mao gets scary [[BlackEyesOfCrazy black sclerae]] with red irises at [[https://yokokasquest.com/comic/chapter-2-page-33/ the start of his fight]] [[CainAndAbel with Yokoka]].
----
* Hartwig from ''Webcomic/AshfacesDaughter'' has his eyes turn completely red whenever his true berserker curse activates.
* In ''Webcomic/{{Archipelago}}'', when someone [[DealWithTheDevil enters the service of the Great Raven,]] their left eye becomes black with a red pupil.
* In ''Webcomic/AverageJoe'', Fatale's eyes go from white, to glowing red behind her mask when angered. [[http://ajcomic.com/?p=152 This]] [[http://ajcomic.com/?p=470 happens]] [[http://ajcomic.com/?p=665 a lot]].
* ''Webcomic/BobAndGeorge'': Helmeted Author has red eyes. This is one of the two things that make him different from [[AuthorAvatar the real Author]] - [[ExactlyWhatItSaysOnTheTin the other one is the obvious]].
* Webcomic/TheBongcheonDongGhost has red eyes, but by the time you see them, it's already very obvious...and too late.
* Early on in ''Webcomic/ChasingTheSunset'', whenever Leaf's eyes go red, it means he's about to unleash the Furies. Not sure if it persists later.
* In ''Webcomic/ComicShorts'', Leko the Robot's normally green eyes turn red when he gets very angry.
* Combined with HellishPupils in ''Webcomic/CommanderKitty'', when [[BigBad Zenith]] [[http://www.commanderkitty.com/2010/07/25/whose-side-are-you-on/ ends up running into Nin Wah again]]. [[spoiler: Inverted after she breaks down and is turned back on sans personality, [[http://www.commanderkitty.com/2012/10/27/not-making-it-easy/ where her red pupils instead seem to signify her being at her most docile and obedient]].]]
* Played for laughs in ''Webcomic/CtrlAltDel'', usually, one example being when Buckley got ''VideoGame/StreetFighterIV'' and grew increasingly frustrated over [[TheComputerIsACheatingBastard the computer AI being cheap]].
-->'''Buckley''': God ''damn it, c.viper''! I swear I am going to [[CutHisHeartOutWithASpoon face-fuck you with a dump truck]]!
* ''Webcomic/CursedPrincessClub'':
** Humorously subverted when Gwendolyn and her arranged fiancé Frederick [[https://www.webtoons.com/en/comedy/cursed-princess-club/ep-25-confrontation/viewer?title_no=1537&episode_no=25 meet a second time]]. Gwen already has a FaceOfAThug that had previously made Frederick resistant to marrying her. And right before this second meeting, he thought he had just killed Gwen by accident[[labelnote:note]]It was actually cursed princess Monika. She was wearing a dress of Gwen's that she stole, and when Frederick saw her from behind he thought it was Gwen. Also, Monika turned into a crow out of Frederick's sight after she fell off the cliff, so she didn't die either.[[/labelnote]] Gwendolyn had earlier heard Syrah give a hypothetical speech for her to use with Frederick to try and reconcile with him. As she tries to remember what exactly Syrah said, she's also TryingNotToCry because she's unused to being so confrontational; the strain of this leaves her eyes increasingly bloodshot, making it look like she has a furious, red-eyed DeathGlare. Combined with her misremembering the lines in a way that sounds like she's unkillable and vengeful against Frederick, this leaves him utterly terrified.
** Played straight with King Leland of the Plaid Kingdom, who has naturally red irises and is very strict with his sons to the point of occasionally being downright [[AbusiveParents abusive]] (especially with [[TheUnFavourite Frederick]]), on top of having a rather Machiavellian approach to ruling in general.
* ''Webcomic/DanAndMabsFurryAdventures'': Aaryanna, Aniz, Dark Pegasus, Kria, and Regina all have red eyes, and are all pretty evil to varying degrees ({{Villainy Discretion Shot}}s notwithstanding).
* The "tainted" or Ver'drowendar from ''Webcomic/{{Drowtales}}'' have red irises; they "have been seeded by a demonic entity". All drow naturally have red pupils, but this is the result of [[http://en.wikipedia.org/wiki/Tapetum_lucidum eyeshine]] and is an evolutionary adaptation to living underground, but results in tainted characters having red on red eyes.
* In ''Webcomic/ElGoonishShive'', the first time Grace is seen to shapeshift [[http://www.egscomics.com/?date=2002-03-10 her eyes go red during the transformation]]. This was dropped during all subsequent transformations.
* In ''Webcomic/{{Endstone}}'', rocking the [[ArtifactOfDoom Banestone]] [[http://endstone.net/2011/06/23/6-04/ gives Jon red eyes.]]
* Parson from ''Webcomic/{{Erfworld}}'' gains red eyes after completing his sword, in a panel that makes him look genuinely frightening for the first time in the series.
* Played with in the ''Webcomic/{{Erstwhile}}'' adaption of "Sweetheart Roland", where red indicates MindControlEyes.
* ''Webcomic/FakeNewsRumble'' subverts this, as Stephen has red eyes (because of [[spoiler:the phoenix'power]]), and [[SubvertedTrope he's one of the protagonists]] [[spoiler:[[MindRape as]] [[DemonicPossession long]] [[FaceMonsterTurn as his]] [[BrainwashedAndCrazy eyes]] [[GlowingEyesofDoom stay]] [[MindControlEyes red]]]], that is.
* ''Webcomic/TheFoxSister'': The [[AsianFoxSpirit Kumiho]] loves this one.
* In ''Webcomic/{{Freefall}}'', [[http://freefall.purrsia.com/ff1400/fc01335.htm a vengeance-minded robot has glowing red eyes for a moment.]]
* ''Website/GaiaOnline'':
** Johnny K. Gambino.
** And, ironically, his opposite number, Vladimir Von Helson, via heterochromias (one gray as is standard for [[OurVampiresAreDifferent Gaian vampires]], one red apparently just for the sake of this trope).
* ''Webcomic/GirlGenius'': while subtle, it is seen well [[http://www.girlgeniusonline.com/comic.php?date=20120102 in this strip]] that Mama Gkika has red eyes. Possibly other Jägers, too.
* Inverted in ''Webcomic/TheGlassScientists'', as it's the calm Jekyll who has red eyes, while more dangerous Hyde's are green.
* Marceline from ''Webcomic/GodMode'' is described as a "[[http://godmodeonline.com/d/20051205.html sado-masochistic chain-smoking woman]]". Which is more or less true.
* ''Webcomic/{{Godslave}}'':
** Anpu's eyes start glowing red just before he delivers an impressive LightEmUp flashbang to Turner.
** Edith's eyes start to glow red whenever she uses her powers extensively.
* ''Webcomic/GunnerkriggCourt'':
** The yellow salamander/lizard-thing. It may not have been evil, per se, but it was certainly dangerous. [[spoiler: The lizard was a house fire that killed a small child and his family.]]
** Zimmy plays an odd variation of the trope. Normally she seems to have BlackEyesOfEvil, but when she is temporarily purified from the etheric miasma that pollutes her spirit by natural rain, it turns out that [[http://www.gunnerkrigg.com/?p=196 her eyes are bright crimson underneath]]. In this condition she is a lot more coherent and amiable than her usual self, but acts as a reminder that she's not exactly normal, either way.
** Hetty has red eyes and is as evil as they imply, as seen from her suggestion that Reynardine kill Antimony and her IrrationalHatred toward Adam.
** The Court robots generally have green eyes, but they'll turn yellow when the robot is alarmed by something and red when they have detected certain kinds of threats. Although they're never evil, when in red-eye mode they do not respond to normal commands and will use violent force against the perceived danger without further warning.
* All the vampires in ''Webcomic/HannaIsNotABoysName'' have red or reddish eyes, although some are more evil than others and the least evil of the four we've seen so far isn't drawn with visible irises at all.
* Panim, the MisanthropeSupreme from ''Webcomic/HelloWorld''.
* ''Webcomic/{{Homestuck}}'' has Calliborn, having candy-red eyes and red swirls on his cheeks [[spoiler: that turn into solid circles once he successfully kills Calliope]]. His eyes are no long red, but no less eerie, [[spoiler: when he transforms into [[BigBad Lord English]] and his eyes turn into constantly cycling pool balls.]]
* ''Webcomic/ImTheGrimReaper'': One of Scarlet's eyes tends to glow when she summons her scythe. Her irises are always bright red.
* In ''Webcomic/ImpureBlood'', [[https://web.archive.org/web/20110616190510/http://impurebloodwebcomic.com/Pages/Issue4PAGES/ib082.html when annoyed]]. Note that her eyes can also glow blue for other magical purposes.
* ''Webcomic/{{Kagerou}}'': when (the aptly-named) Red takes over Kano's body, his eyes turn red. And Red is a psychopathic rapist and murderer.
* Zig-zagged in ''Webcomic/KillSixBillionDemons'': red eyes aren't uncommon in the AmazingTechnicolorPopulation, but they do show up on some of the most dangerous people in Creation: GodEmperor Zoss and OneManArmy Maya.
* Quite a few characters from ''Webcomic/LsEmpire'' (most notably [[spoiler:Dark Star]]). Pix averts this as, despite him always having red eyes [[spoiler: due to being Dark Star's son]], he's [[IncorruptiblePurePureness the nicest guy in existence]].
* In ''Webcomic/LookingForGroup'', most characters, regardless of whether they are evil or good, will display the "burst of anger" or bloodlust variant. Bloodrages will most prominently display it before dishing out punishment, but even NiceGuy Cale will display them in bouts of righteous anger.
* Valentino, the BigBad of ''Webcomic/{{Marilith}}'', has red eyes. The effect is highlighted by the rest of the strip being mostly in black and white.
* Otherworlders in ''Webcomic/{{Miamaska}}'' have red eyes and purple sclera. Citizens see this as a threat to their town and [[http://miamaska.tidalcomics.com/index.php?strip_id=49 take action accordingly]].
* ''Webcomic/{{Noblesse}}'': One of the major factions in the story is [[OurVampiresAreDifferent the nobles of Lukedonia]], all of whom, including the protagonist Rai, have red eyes.
* ''Webcomic/TheOrderOfTheStick'':
** Sabine's eyes glow red in her true form. There is an early warning of her true nature in [[http://www.giantitp.com/comics/oots0053.html this strip]], which is before she's revealed to be a fiend. Later, the glowing-red eyes are a [[http://www.giantitp.com/comics/oots0356.html hint for the reader]] that she's shapechanged.
** Xykon has [[GlowingEyelightsOfUndeath glowing red eyes]] too.
** Also, [[http://www.giantitp.com/comics/oots0079.html Loki]], god of Flames and Chaos.
** [[spoiler: Malack's]] eyes change to red from their usual [[spoiler: pink]] when using his vampiric abilities.
* ''Webcomic/PennyArcade'':
** Tycho gets these whenever he gets particularly angry or is acting particularly evil, apparently because his body harbors a dark spectre from the world of dreams.
** ''Webcomic/PennyArcade'' sub-comic ''Automata''. There's something in that time signature and it changes the eyes from the standard blue to...[[http://www.penny-arcade.com/comic/2009/8/3/ help.]]
* In ''{{Webcomic/Phantomarine}}'', Cheth's eyes turn red when he is experiencing [[https://www.phantomarine.com/comic/444-special-delivery extreme emotions]].
* ''Webcomic/RescuingDara'' [[AvertedTrope averts]] this trope, with the hero Chivai and both the heroic and villainous Lucarios all having red eyes.
* In ''Webcomic/{{Roza}}'', [[https://web.archive.org/web/20090210011326/http://www.junglestudio.com/roza/?date=2007-05-23 the monstrous guard]].
* Subverted in ''Webcomic/RustyAndCo'' by a [[TheBrute hulking]], red-eyed mercenary from a [[BeastMan gnoll]] tribe: cousin Slobber, the friendly pug who [[http://rustyandco.com/comic/level-7-77/ loves cotton candy]] and happily pulls a MookFaceTurn when his old boss takes a dive into lava.
* While this is not common due to the art style of ''Webcomic/ScandinaviaAndTheWorld'', it does occasionally show up, generally when either [[http://satwcomic.com/dysfunctional-family Åland]] or [[http://satwcomic.com/smalltalk Finland]] are especially upset.
* ''Webcomic/SlightlyDamned'': Subverted with [[ThePollyanna Buwaro]] [[note]] At least when he isn't [[spoiler:''completely'' [[SuperpoweredEvilSide berserk]]]] [[/note]] or [[DefectingForLove Lakritz]] who are both among the kinder demons around, however red seems to be one of the most common demon eye colors and most of them play it straight. The most notable of these demons is [[spoiler:Iratu]] who at first seems to be friendly but [[InVinoVeritas that's]] because he was drunk and when we see him sober we learn he is a cunning and powerful General of [[TheLegionsOfHell Hell's Army]] who [[spoiler:leads an attack on a major city that kills hundreds if not thousands of innocent people]].
* ''Webcomic/SluggyFreelance'':
** In one story, Bun-bun the evil mini-lop rabbit is stuck with the annoying animated shadow of the groundhog who's the AnthropomorphicPersonification of Groundhog's Day. Unable to attack the insubstantial creature, he's forced to suffer all its antics. But finally it manages to do something that angers Bun-bun so much that he finally snaps. He gets ''so'' angry his eyes turn red, and subsequently he emits a red aura. Insofar as there is an explanation to this, it could be that [[spoiler: by that time Bun-bun was already a mildly supernatural being due to being saddled with being the Easter Bunny as well as the official "groundhog"]].
--->'''Shadow''': What do you want to do?\\
'''Kiki the ferret''': I have a pretend karaoke machine made from a toilet-paper roll!\\
'''Shadow''': You like karaoke too?\\
'''Kiki''': I LOVE karaoke!\\
'''Shadow''': A one and a two and a\\
'''Bun-bun''': '''''That's IT! Everybody dies!'''''
** In "Anima: Culmination", Troloria, a psionicist with godlike powers, normally has blue GlowingEyes. Whens he gets really angry, she gets first red dots in the middle of them and then wholly red glowing eyes.
* Eli of ''Webcomic/SoulToCall'' has red, sometimes glowing eyes. While the population at large, especially [[ChurchMilitant The Order]] believes that he is dangerous, the fact is, that he is actually very meek, and shy. The red eyes glowing means that ''something else'' has just shown up, and '''that''' is what's actually dangerous.
* Dr. Schtein of ''Webcomic/StringTheory2009'' has prosthetic eyes that glow a sinister red, having lost his original eyes in a lab explosion. Thus far, they seem to be foreshadowing his eventual rise to supervillainy. They even glow in the dark, much to the horror of his prison roommate.
* Darko, the mercenary from ''Webcomic/TheStupiders'' has glowing red eyes: ''[[http://www.stupiders.com/comic.php]]''.
* In ''Webcomic/SurvivingRomance'' it's one of the signs of someone having become a zombie.
* ''Webcomic/{{Terra}}'' has Sovereign Northazul Kalar, EvilOverlord of an empire trying to conquer the galaxy, and his son Solus Kalar, head of a NebulousCriminalConspiracy that started out as a private army for Northazul.
* ''Webcomic/TowerOfGod'':
** Ha Yuri Jahad just lives and breathes this trope, especially when she gets serious.
** Pedro the "Death Eye" has piercing red machine-like eyes that are his most distinguishing feature. [[ObviouslyEvil He just so happens to also be]] [[DragonWithAnAgenda Karaka's]] [[ObviouslyEvil underling]].
* Subverted in ''Webcomic/TwoGuysAndGuy'': Wayne thinks [[http://www.twogag.com/archives/2204 Guy's eyes glow red in the dark]] ''because'' she's evil. [[spoiler: The optometrist is pretty upset Wayne didn't mention it sooner, implying it's not only unnatural but also dangerous.]]
* ''Webcomic/{{Underling}}'': [[https://web.archive.org/web/20100619071344/http://underlingcomic.com/page-seventy-five/ Demons.]] This is awkward for Lazarus when he gets them, and a tail, and horns.
* ''Webcomic/{{Waterworks}}'': Flush gains a set of red eyes just before he uses his deadly SpinAttack. [[http://mspfanventures.com/?s=43&p=238 "oh hey flush. you're sporting the evil red eye look rather nicely"]]
* ''Webcomic/WeakHero'':
** A variation in that Forrest constantly seems to have bloodshot eyes, meaning that it's his sclera that look red while he goes around violently beating people up.
** Robin has narrow eyes with small red irises, and is a BloodKnight that thirsts to take on anyone in a brawl.
** When Wolf is shown proof that Rowan was the one who took his prized bag, an aura flares about him and his eyes go bloodshot in rage. Jared compares it to a rabid dog being given meat.
** [[InvincibleVillain Donald]] is one of the nastiest characters in the story, and his blood-red eyes combined with paper-white skin give him the appearance of a vampire.
* In ''Webcomic/YokokasQuest'', Mao gets scary [[BlackEyesOfCrazy black sclerae]] with red irises at [[https://yokokasquest.com/comic/chapter-2-page-33/ the start of his fight]] [[CainAndAbel with Yokoka]].
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