LostSoul
Adventurer
3-dimensional characters are a must.
In a strange way, I think morale checks and reaction rolls would help. It makes you sit up and take notice of the fact that violence isn't pretty, that most creatures would rather not jump into potentially lethal fights, and if things don't go their way they'll turn tail and run. NPCs won't draw steel and leap into battle as soon as they see the PCs. They'll attempt to parley; if battle begins, morale checks mean that you won't have them fight to the last man very often.
I find that, without those mechanics, "attack on sight" and "fight to the last man" become the default instead of a very rare occurrence. (Probably because I'm a lazy DM/I've got too much else to focus on.) When random slaughter isn't common, bloodshed tends to stand out.
In a strange way, I think morale checks and reaction rolls would help. It makes you sit up and take notice of the fact that violence isn't pretty, that most creatures would rather not jump into potentially lethal fights, and if things don't go their way they'll turn tail and run. NPCs won't draw steel and leap into battle as soon as they see the PCs. They'll attempt to parley; if battle begins, morale checks mean that you won't have them fight to the last man very often.
I find that, without those mechanics, "attack on sight" and "fight to the last man" become the default instead of a very rare occurrence. (Probably because I'm a lazy DM/I've got too much else to focus on.) When random slaughter isn't common, bloodshed tends to stand out.