Springhosen
Kahnum of Outworld
I believe I posted those under the spoiler line in my original post.
If you would like specifics, I'll be happy to tell you, but not here where I might spoil anything for someone who has yet to play the game and wants to be surprised during the boss fights and what not.(SPOILERS: These Hunters are freaking ridiculous, they just won't die! And fighting Nemesis? Even the zombies are pretty ruthless at times, especially when you're bleeding or are at certain points in a boss fight.)