Monday Moe Musume - Yandere

Yandere (ヤンデレ?) is a Japanese term for a person who is initially very loving and gentle, then at one point becomes deranged or psychotic, often brutally so. Yandere is a combination of the two words yanderu (病んでる?), meaning to be sick, and deredere (デレデレ?), which is defined as exhausted or lovestruck.[1] Much like the tsundere term, there is also the related noun yanderekko (ヤンデレっ娘?) which refers to a girl with a yandere personality (like how a meganekko is a girl with glasses), the suffix -ko (娘?) meaning "girl" and is the equivalent of "-ette/-elle".

awww... nice boat hat... yes?

To set an example, we should look no further than this archetype's gleaming poster child, School Day's Kotonoha Katsura.

Love kills wouldn't you say.

And if you thought dealing with one homicidal partner was troublesome enough (provided that you're the kind who pretty much taps every single girl in school who comes on to you), try handling an entire class of possible yanderes.

But some of the more common staples you'd see of Yandere's would be Elfen Lied's Lucy.

Here's what TV Tropes has to say about these dangerous ladies.

The word "yandere", a term that blossomed in moe fandom, refers to a character who is crazy about someone else. Literally. Despite the anime-inspired name, this type of character is much, much older than that, as one of the earliest examples is Medea of Greek Myth.
The character almost always appears cute and harmless on the surface... but underneath they are obsessive, controlling, and sometimes just plain insane. Woe to anyone who happens to be the object of their "affection". Even more pity should be saved for anyone who gets in the way, as the psycho-obsessive is amazingly unwilling to put up with any rivals. Some have long histories of mental instability and in some cases have always been a little "off", perhaps the product of Break The Cutie. Often eventually goes off the deep end and becomes an Ax Crazy Girl With Psycho Weapon.

Speaking of staples, Senjougahara-san's relationship with Arararararagi-kun does border on yandere as some of you might remember from Hachikuji Mayoi's arc.

Intriguingly enough, TV Tropes has classified Belldandy, of all people, as a borderline case, and I quote..

Belldandy from Ah My Goddess displays some of these tendencies, although they are quite mild. And they have to be, since her self-control is the reason why she's allowed access to her ENORMOUS powers...

You get into a relationship with someone who does possess celestial powers, yeah, you will eventually find yourself on the receiving end.

As far as the relationship I share with my eldest musume, well.. I don't think you could call yandere.. in fact, the only way to say it would be that she's just simply violent at how she gets what she wants.

Citing a example of a reverse situation though, would be Misa Amane, though she may have a Death Note, she rarely exercises it's powers towards L, instead falling for him as he killed her parents' killers, consequently leading to her near fanatical devotion.

*edit: corrected by member Cshen

So, wouldn't any of you care to share these ladies some love? I'm sure they'll be deathly faithful.