Red Eyes, Take Warning/Playing With

Basic Trope: A character with red eyes has a high probability of being evil.
 * Straight: Lord Bloodstone has red eyes.
 * Exaggerated: Lord Bloodstone has red eyes and Glowing Eyes of Doom. Thus, Glowing Red Eyes of Doom, Take Warning.
 * Alternatively, Lord Bloodstone's eyes are completely red, including his scleras and pupils.
 * Justified: Lord Bloodstone is an Evil Albino.
 * Alternatively, all those who are granted power from a sinister source, such as a demon, have their irises stained red by it.
 * Lord Bloodstone is so angry that he actually burst a couple of blood vessels!
 * Inverted: Lord Bloodstone has Blue Eyes.
 * Prince Strongheart has red eyes.
 * Subverted: A character with red eyes is established as dangerous, but turns out to be the hero.
 * Double Subverted: But it turns out that the hero is actually The Man Behind the Man.
 * Parodied: A character puts in red contact lenses. They immediately go on a killing spree.
 * Lord Bloodstone routinely douses himself with pepper spray to ensure that his eyes stay red when he does something evil.
 * Deconstructed: Lord Bloodstone was hated and feared ever since he was a child because of his sinister-looking eyes. The abuse he suffered twisted him into the villain that he is today.
 * Reconstructed: Lord Bloodstone was hated and feared ever since he was a child because the power of the Demon King that dwells within him, and people felt inherently afraid of him. As he grew more twisted and bitter, his eyes became redder, a sign of the Demon King gaining control. The hero has the same power, but maintains his heroic nature, and so his eyes are an untainted blue.
 * Zig Zagged: There is a wide variety of eye colors people can have, meaning that anyone, good or evil, can have red eyes.
 * Averted: No-one has red eyes.
 * Enforced: "Let's give the Big Bad red eyes so he can be identified as the villain."
 * Lampshaded: "So you're behind this all? I should have known since the moment I looked in your evil red eyes."
 * Downplayed: Lord Bloodstone has bloodshot eyes.
 * Invoked: "He must be the bad guy. Just look at those eyes."
 * Defied: "My eyes may be red, but my heart is pure!"
 * Discussed: "So, are red eyes a requisite for villainy?"
 * Conversed: "Why do such a high proportion of evil-doers have red eyes?"

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