Kor, Koloth, and Kang. Followed by Martok and Gowron.
I really enjoyed Korax's baiting of Chekov and Scotty in "The Trouble with Tribbles", too. Especially when he did Scotty's accent. A Scottish Klingon is so cool on so many levels!
Kor. John Colicos made Captain Kor likeably sly and roguish. He could mug and stand toes to toe with Kirk in the classic series. He made doing his job and being a warrior look like it was a good time. His reappearance in DS9 was well written and true to Trek remaining relevant and topical exploring issues of aging and dignity. An amazing character from the beginning to glorious end.
Comments
Gowron for being the most entertaining klingon. At least, before he went nuts in the later course of DS9.
I'll see myself out, don't bother.
On a serious note: Kor (best klingon death) and Martok (quotes!)
I really enjoyed Korax's baiting of Chekov and Scotty in "The Trouble with Tribbles", too. Especially when he did Scotty's accent.