|Feel the love?|
Yandere characters exhibit a level of bipolar disorder where they would swing from a depressive episode that may contain psychosis to an elevated mood that is close to euphoria. The euphoric stage is known as Bipolar Mania, where someone has increased energy and a feeling of absolute bliss. It swings to the other extreme after a period of time to the depressive state. In the depressive state they can become more depressed, but in more extreme cases they start experiencing psychosis. People in psychosis may experience hallucinations and delusions, which may change the personality and the thought process of the person. I have to stress this, characters who are yandere have a level of bipolar disorder, but not everyone who is bipolar is a yandere character type.
tsundere characters, there are a far larger proportion of female characters that have this personality trait than males. They also tend to dress up a character with a yandere personality with male ideals of a “perfect woman.” Anime and manga characters with this disposition trait tend to be exceptionally beautiful, have enviable proportions, and have an affable temperament. Not only that, this character has absolute loyalty to whoever they are in love with. Yandere characters, like tsundere characters also tend to spice up whatever story they are in and they make it more interesting. Yandere characters are popular; it is a combination of idealized good looks, incredible loyalty, and a good story element to the largely male audience which contributes to their popularity.
When written well, a yandere character adds a lot to the storyline. The insanity of Yuno Gasai in Mirai Nikki is a big draw for the audience. It adds an element of unpredictability in the storyline that otherwise would not be there. Part of the unpredictable element is the danger that is now added in the storyline. The other draw is that it typically happens to characters where there is a huge discrepancy with their looks and their actual personality. The difficulty is that the character is exhibiting a personality disorder that in real life would normally be dealt with through a psychologist. Now you know what a yandere character is and how they are in anime and manga.
|Belarus - Hetalia|
|Kotonha and Sekai - School Days|
|Shion (and to a degree Mion) - Higurashi|
|Shouko - Baka to Test|
|Nanami - Revolutionary Girl Utena|
|Lucy - Elfen Lied|
|Kaede - Shuffle|
|Yuno - Mirai Nikki|