Who do you kill and what's your rationale?
I decided to kill all my orc followers (blame Tolkein for my distrust of orcs) - but that only accounted for 5: Borgakh, Ghorbash, Lob, Ogol, and Ugor.
Then I killed Ahtar, the executioner from Solitude, because his quest (to do him a favor and let him become a follower) never triggered, which meant there was no way to obtain his unique axe other than his death.
For #7, I killed Faendal - either he or Sven weren't going to get along with me anyway, and playing a Nord, I sided with Sven, so Faendal had no in-game purpose left and he didn't like me (but the game counted him as friendly).
I'm about to start the Dark Brotherhood quests, but the only friendly NPC I know I'll be able to kill is Narfi (I assume he counts as a friendly kill since I did his quest for him) - so I assume he'll be #8.
But now I'm stuck. I don't want to kill NPCs that provide services (merchants, buyers of wheat, ore, etc.), NPCs that are potential followers/spouses, or NPCs that have any in-game value. Ideally, I'd like to kill some really unsavory or uncool NPCs that just happen to regard me as friendly - like Faendal was a good example.
Who did you kill, and why, and who would you recommend for me to kill?
Thanks.