Nomenclature: A system of names used in a particular discipline, as in medicine and surgery, anatomy and biochemistry, etc. A standard system of nomenclature presupposes the existence of an organized classification of the entities within that field. From the Latin nomenclatura, a listing of names, from nomen, name, + calo, to proclaim.
Yangire (also referred to Cute and Psycho) is a Japanese term used to refer to normal people who suddenly become violent, sometimes due to a past trauma. Yangires are very similar to Yanderes, both are people who suffer from personality disorder and can easily become violent and extremely dangerous.
(definitions copied from wiki) I've been in love with these kinds of characters and the series they were in ever since I first discovered anime 8 years ago. However it was only just recently that I found the Yandere and Yangire terms. Turns out there are a bunch of people who enjoy these series, but have also never known these terms.