In the raid? KTIn Hearthstone? Anub-arak
My favorite Naxxramas boss had to be Instructor Razuvious.
Gonna have to say Thaddius. He just adds so much to the setting, and the lore behind him is just fantastic. If creepy and disturbing.
The Four Horsemen by far, the group seems to have my favorite loot table out of every boss.
Grand Widow Faerlina, sexy portrait
Thaddius was the best. I remember doing Undying achievement when one of the guys feared he will fail it went /follow on other mate :D /facepalm of the day
Four horsemen required so much coordination. Was awesome to have a fight where the raid leader could not see everything going on. People had to rely on their own small team.
Four Horsemen has always been my favorite...they have a great aesthetic, and their dialog throughout their wing is always a blast.
My vote goes for Kel'Thuzad. Always been a fan of him since WC3
Four Horsemen for sure
My personal favorite boss to fight in the actual game was The Four Horsemen. In Naxx, at the time of writing this, my current favorite is actually Heroic Grand Widow Faerlina. She has a bunch of threats and puts you on the clock the turn the game starts.
Patchwerk for me too. A great boss
Kel'Thuzad, as long as no one killed Mr. Bigglesworth...
Heigan, because putting that Nerubian Egg to the left is so good :)
So far Heroic Maxenna.