After I saw Mae Karakade I don't think anyone could beat her! It's the extreme ends of beauty & wretched evilness! She's very beautiful - much much more beautiful than Kadesurang who's actually quite mild looking in comparison but that aura of darkness & cruelty is purely the devil. She beating up the servants in one thing but to act innocent "oh no! How could that be?!" after she has maliciousness drowned their neighbour's poor maid is just horrible.
Lol I would say our Mae Ying Karakade was the most evil. She was just cruel to everyone around her, even the people that loved her!