It depends on what you mean by insane ;)
If you're okay with not japanese dramas (by checking up your list it seemed that was what you watch the most) I can give you a few examples of characters that are, in my opinion, quite mad ;)
Chinese drama Le Jun Kai: the main lead seems to really have a judgemental problem, but the drama was really good!
As for Korean dramas: in both King2Hearts and I hear your voice the villain was really mad and horrible, if you want to check those out ;)
Anyway, enjoy your time on MDL!
