Yandere a term for a character who at first is very sweet, loving, innocent, and overly affectionate like a normal deredere character, but over time begins exhibiting signs of being mentally sick as a result of having a too strong love. Yandere is a sickness born from too much love. They are the kind of character who will act all deredere and lovey-dovey when their relationship with their romantic partner is going well, but when something triggers jealousy or possessiveness they act impulsively in a way that makes them seem mentally sick.