Who was your favorite Lich King?

Ner'zhul, Arthas or Bolvar?

I personally thought Ner'zhul was the best given he successfully got freedom from the Legion and I wish we could have got him and Arthas as one being as Arthas being the prime personality didn't make sense to me given his lack of experience and how easily Ner'zhul and Mal'ganis manipulated him.