Who is the Yandere King and the Yandere क्वीन ?

While, I don't know any Yandere Kings I know quite a few Yandere Queens.

Anyway, I think the Yandere क्वीन is either Shion Sonozaki or/and Yuno Gaisai ( pictured ).
If unofficial ऐनीमे count then Bebe takes the plate as the Yandere Queen.^^