A duo (often a romantic couple) whose contrasting hair colors signify their opposing world-views. Said hair colors are usually blond and black or dark brown, but it can just as well be red and black, or blond and blue--the important bit is the contrast. Their respective personalities are then typically defined as follows: Ultimately, however, the Opposites Attract. This is particularly a staple in lesbian romance fiction, where common pairings include a "good blonde" and a "bad brunette". A common inversion found in recent works features a slightly altered setup: