When a character has differently colored eyes, it may represent one of the following:

* DualityMotif: Differently colored eyes foreshadow/reinforce a dual nature about the character.
* ElectronicEye: One eye is [[{{Cyborg}} cybernetic]].
* GlassEye: One of their eyes is a prosthesis.
* MadEye: One of the eyes is considerably weirder.
* MagicalEye: One eye grants them magical powers.
* MarkOfTheSupernatural: Marks the character as special in some way, whether as magical, nonhuman, or something else entirely.
* [[/index]]RealLife[[index]]: [[http://en.wikipedia.org/wiki/Heterochromia_iridum Heterochromia iridum]] Bear in mind that while healthy individuals can have this--see star baseball pitcher [[https://goo.gl/images/HFW7Q9 Max Scherzer]]--it is often a sign of medical problems.
* RedRightHand: To foreshadow/reinforce something evil about the character.
* SharedUnusualTrait: Two or more characters have differently colored eyes because they're related or connected somehow.