Bloodletter
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Bloodletters are Khorne's foot soldiers. While getting to a battle they march as a unit, but when they get into the battle they go fuck-crazy with rage and actually see it as a competition amongst themselves to fuck up the enemy worse than the other Bloodletters. They have rage-faces and bodies that make them look like Halo 3 Elites (just look at their legs). Like most Khornate daemons, they have a sense of pride and will usually fight bravely, ferociously, and honorably, but they sometimes resort to cheap-ass Tzeentch-esque tactics (i.e. cunt-punching a Bolter Bitch).
Heralds of Khorne lead the legions into battle. They make a mockery of the Imperial Guard by marching in disciplined regiments accompanied by horns (the marching kind, not the spikey kind) and war drums (oh so Ork-y); of course, that Imperial-ish manner goes to the warp when they charge into battle, going into a battle-rage and getting shit done. Bloodletters wield a demonic blade known as a hellblade which is given to them by Khorne himself and is so sharp that wounds inflicted by a chainsword look like paper cuts by comparison.
The most famous Bloodletter is imaginatively named Skulltaker, and is so bad-ass that Khorne occasionally allows him to keep the skulls of his most challenging opponents as trophies rather than adding them to the Skull Throne; seeing as these victims include several Grey Knight captains (however the hell that happened), an Ork Warboss, and seventeen Eldar Exarchs, this seems only fair.
Despite being made of awesome sauce, they are for unknown reasons not as popular with fa/tg/uys as their Slaaneshi equivalent, hence why that page has over 9000 images and this page has few.
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How they're depicted on /tg.
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The best of both worlds.
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An army of Blood Letters. FOR THE BLOOD GOD.