I need yandere.

[Sephirothskr]

Name all Yanderes you can think of. (Anime name please.) I need as many as possible. (Preferrably effed up shows)

[Bollocks]

Obviously Yuno from Future Diary (fuck that show).

Senjougahara from Bakemonogatari goes yandere from time to time.

I can't remember her name but there's a yandere character in School Days.

People called the Ayase from OreImo yandere. I never saw it myself but apparently that's a thing.

Finally, Kaede from Shuffle!

[Sephirothskr]

I'm looking for really like. twisted yandere girls xD I got yuno and Shion.

[Kireblue]

Rize Kamishiro (Tokyo Ghoul), Rena Ryuugu (Higurashi), Shion and Mion Sonozaki (Higurashi), Ryoko Asakura (Haruhi), Shiro (Deadman wonderland), Touko Fukawa (Danganronpa)

[Jasta85]

elfen lied, I recommended reading the manga, it goes beyond the anime and is just better in general, plenty of brutal yandere moments in there.

[Scintilla]

I can't remember her name but there's a yandere character in School Days.

That would be Kotonoha, the long-haired one. Note however that she really doesn't do anything very crazy on-screen until the very last episode, if I remember correctly.