Yin-Yang is two opposite personalities in one body. Yin, the lighter half, is kind, sensitive, understanding, and gentle. Whereas his brother Yang, is chaotic, unpredictable, aggressive and has a tendency to make fun of others. People refer to them as Yin-Yang when talking about the two of them combined and not one of their individual halves. It’s rare, but sometimes they will both grow fond of one person. Note: they do not get along well and disagree on practically everything.