Honestly, I’m kind of with the OP. I really regretted killing Nazgrim. Because all he wanted was for the Horde to prosper, and even when you went after him, it wasn’t some kind of “MAWHAHA THE WARCHIEF” crap. It really was about honor for him. And he even goes down memory lane with you briefly.
I really wanted to save Nazgrim.
Am I the only one that felt good about taking down Ysera? It’s not every day you get to take out an aspect… and the Green one too! Suck it, emerald snoozefest.
Galakrond would be proud.
I didn’t kill him but he died, Graz. That guy in that dungeon that goes, “Graz smash!”
Who has his heart stopped at the final boss. Made me sad. He did so much for us, clearing out mobs.
This is a bit of a necroed thread but my answer includes another character now.
First: I will always be upset that we had to kill Nazgrim. I really wish he surrendered at like 5% health and loved to fight with the horde another day.
Second: Rastakan, I absolutely loved his character and to have him replaced with Talanji almost seems rude. I’d have much rather seen a redemption arc of sorts where he became a proper king. So disappointing.
Almost every rare in MoP
Seriously, what the heck…
That image doesn’t look like BWL to me. Did it change?
As for the original post, I felt bad killing Defias. That’s why I basically only play night elves; you don’t have to kill intelligent opponents until you’re inured to killing.
RIP Bossy you beautifull bovine.
As I sit here giggling, I know dang well I always cringe and feel bad when I hear that critter death noise as my bear or multi shot nails one. 
That’s pretty cool!
/ponders what would happen if two people hung around some critters with Unborn Val’kyr and Lil’ K.T. 
Malygos, Deathwing, Ysera, Murozond… We’re literally 4/5 on killing aspects at this point.
This topic gives me hope. 
Runas. Poor magic addicted Runas…
The peasants in the DK starting area, you have to kill them for a quest.
…and I do get really sad when I accidentally kill a bunny, the sound they make when they die T.T
Are you still there, friend? I can’t see you anymore.
Yeah but I solo’d Ysera. That wasn’t a raid boss.
I feel bad when I killed the Unknown Soldier rare in Duskwood shortly after he was first added in the Cata pre-patch. It’s a skeleton wearing GM armor kneeling next to a secluded grave north of Abercrombie’s tower. I don’t kill him anymore.
I regret killing any of the bosses that would have destroyed the world because this game needed to die years ago.
And once you know the story about the Defias Brotherhood, they have a very valid reason to be upset and I felt bad for fighting them.
For me, it’s not who I’ve killed it’s who I know we’re going to have to kill: Sylvanas. Granted, she has it coming but, she was always one of my favorite leaders and I was so, so, so excited to see her become Warchief. Then… we get what we have today. It’s been the only thing that has ever shaken my loyalty to the Horde. How can I support a faction when we don’t even have a decent leader to follow? Vol’jin was that leader… but died. Thrall was that leader… but left us with Garrosh and we know how that worked out. This was the Banshee Queen’s chance to prove that trusting in her was, in fact, worth while and the right thing to do. Now, I just have a bad taste in my mouth and a serious urge to shove my sword down Nathanos’s throat, and for the first time in my 16 years of playing wow… I have a max level alliance character.
Honestly, I was a bit hopeful that she’d be sticking around as Warchief for a while. She’s been morally challenged (read: evil) forever but I wanted her to grow into the role as the Horde’s foil to Anduin being all goody two-shoes. I was hoping it’d be a case of “she’s an evil psycho but she’s our evil psycho” for the Horde.