This is something of a logical counterpart to Common Eye Colors: If a character has freaky, cool, or otherwise unusual hair colours, their eyes are liable to match. "Unusual", of course, needs to be taken with a grain of salt when it comes to Anime Hair. Comic books and western animation are also likely to display this trope. Some series use this to make a character stand out as being "weird" or "different", especially if it's an uncommon color. Others use this for their entire cast. May be used as a form of Technicolor Eyes. Not to be confused with the carpet matching the drapes.