History Main / RedEyesTakeWarning

** The BigBad has eyes that are black pits with glowing red irises and elliptical pupils. They glow malevolently whenever they are feeling sadistic, asserting their dominance or revelling in the plans they have unfolding across the globe. [[spoiler:Salem's eyes are similar to the glowing red eyes of the Grimm, and combines with her bone-white skin, red vein-like markings and black clothing to give her the appearance of a humanoid Grimm. Along with her ability to control the Grimm, this helps make it ambiguous as to whether she's human or something else until her backstory is revealed in Volume 6.]]

** Luz gains crimson red these taking a Quirk with her PowerParasite ability, or is going on or about to go on a RoaringRampageOfRevenge.[[spoiler:They become permanently red in Chapter 21, after discovering the dead of her mother.]]

* ''Fanfic/AllForLuz'' (''WesternAnimation/TheOwlHouse'') & (''Manga/MyHeroAcademia'')

A subtrope of TechnicolorEyes. Compare GlamourFailure, RedIsViolent, CreepyBlueEyes. Contrast RedIsHeroic.

Not to be confused with being worried about a late-night airline flight (which would probably fall under PlaneAwfulFlight), or with the film ''Film/RedEye'' (which is about such a flight), or with the liquor. Sometimes a part of BurningWithAnger, and thus a harbinger of wrath from the SevenDeadlySins wrath.

* [[spoiler:Oswald Sherzikien]]'s eyes turn red when he [[spoiler: [[OneWingedAngel becomes a gigantic cartoon monster]]]] near the end of ''[[WebVideo/TheCartoonMan Journey of the Cartoon Man]]''

* ''WebVideo/{{Dad}}'': In "Dad Loves Mom", it's mentioned that when Mom is upset, "her eyes glow red"; [[spoiler: with the implication that the family aren't even human, it's likely this isn't just figurative.]]

* ''Fanfic/TheBridge'':

* In ''Fanfic/TheNewAdventuresOfInvaderZim'', the sclera of OurVampiresAreDifferent member Norlock's eyes are blood red, highlighting his BlackEyesOfEvil pupils and irises.

* ''WebAnimation/HazbinHotel'':
** Alastor the Radio Demon has bright red irises against blood red sclera, and they glow red when he goes into his GameFace. He's also one of the most powerful and notoriously evil demons in Hell.
** Cherri Bomb has one large red cyclops eye and is a violent psychopathic anarchist.
** Charlie's GameFace comes complete with hellish red eyes, a sign that no matter how sweet and perky she is, she's still the ''princess of Hell''.

*** Kiyotaka Ishimaru technically fits - even though he never makes a FaceHeelTurn, his red eyes are a predicator for [[spoiler:when he ([[MaybeMagicMaybeMundane possibly]]) absorbs Mondo's spirit and becomes the loud and aggressive Kiyondo Ishida — although even then it's a bit of a fake-out, as despite his more aggressive mode of speech he's just as harmless as Ishida as he was before. Unfortunately — and perhaps partially thanks to this trope — it's enough to convince Hifumi that he needs to be put down for the good of the group.]]

*** Kiyotaka Ishimaru technically fits - even though he never makes a full FaceHeelTurn, his red eyes are a predicator for [[spoiler:when he absorbs Mondo's spirit and becomes the loud and aggressive Kiyondo Ishida]].

* Zigzagged in ''WebVideo/CriticalRole''. Mollymauk's eyes are entirely red, lacking a pupil and an iris. This in itself doesn't actually mean much; Molly's red eyes are due to his tiefling heritage, and while he can be abrasive, he is a genuinely nice person. What ''is'' strange are the nine more red eyes he has tattooed all across his body, especially since Molly himself [[AmnesiacHero woke up with complete amnesia]] about two years prior to the start of the story and has no idea where they came from. [[spoiler:It's not until the final arc of the story, months after Mollymauk's death, that the Mighty Nein encounter [[BigBad Lucien]], the person Molly was before losing his memory. Unlike Molly, Lucien knows that the red eye tattoos are gifts of the [[EldritchAbomination Somnovem]], and can use them to ''devastating'' effect; summoning fireballs, creating an anti-magic field, and unleashing a psychic assault that nearly {{One Hit Kill}}s Beau and Caduceus.]]

* Website/NobodyHere: You can give red eyes to the creepy girl's face in "[[https://nobodyhere.com/justme/present.here Present]]", if you so desire. More pressingly, [[spoiler:she will always have glowing red eyes during the JumpScare]].

* Website/NobodyHere: You can give red eyes to the creepy girl's face in "[[https://nobodyhere.com/justme/present.here Present]]", if you so desire. More pressingly, [[spoiler:she will always have red eyes during the JumpScare]].

* Franchise/TheHauntedMansion: In Phantom Manor (the Paris incarnation), the Phantom's eyes glow red at passing riders both times that you pass up close to him (after leaving the Bride's Boudoir, and when leaving Phantom Canyon).

--> '''Skipper''': Glowing red eyes, that's almost never good.

** The gang of pterosaurs that prey on the possums have them during their chase scene, although the color is most visible when that one pterosaur in the gang [[spoiler: gets himself blown up into a living balloon from a gas berry. Unable to contain the immense amount of the berry's gas released within himself, his eyes are filled with the excess, forcing them out of their sockets and inflating into two large balloons. With two balloons for eyeballs, the red color is then apparent.]]

** The gang of pterosaurs that prey on the possums have them during their chase scene, though the color is most visible when that ''one pterosaur'' in the gang [[spoiler: gets himself blown up into a living balloon by a gas berry fired down his open jaws. Having to contain so much of the berry's gas within himself, his eyes are filled with the excess, forcing them out of their sockets and inflating into two large balloons.]]

** The gang of pterosaurs that prey on the possums have them. The color is more noticeable when that one pterosaur [[spoiler: gets himself blown up into a living blimp and his eyes bulge out into two large balloons.]]

** Season 2 introduces Fang as the main cast's relatively new classmate, who has red eyes and glasses which appear to have a red glowing tint in the dark. He's aloof, arrogant and has a power band like each of the main characters, and the one who provides such power sources, Ochobot, faints at the sight of him. This makes the heroes wary of him, and it doesn't help that Fang sees [=BoBoiBoy=] as an obstacle to his quest for popularity, which has lead him to team up with the heroes' enemies at times. It's {{subverted}} later on, however, as he eventually befriends the heroes and proves to be well-meaning. However, his red eyes do foreshadow that [[spoiler:he's not [[HumanAlien exactly human]]]].

** The gang of pterosaurs that prey on the possums. [[spoiler: the color is more noticeable when a pterosaur gets himself blown up into a living blimp, his eyes bulge out into large balloons.]]