I actually kill a lot of dream characters because most of mine are evil monstrosites and abominations. Here's a few stories but beware, they are rather detailed and lugubrious.
I once saw a man in robes with a match that seemed to be eternally burning. He was holding an animal, that seemed to be a cross between a cat and a jerboa, by its neck. He looked at me and grinned while he said: "You'd be surprised how quick fur ignites." I didn't think twice before I lunged myself at him. Not out of pure despise, anger or hate. But only because I felt like he gave me enough reason to do so. I pushed him to the ground and took his match, which I then used to melt his eyeballs. I then slid it as far back in his throat as it would go. He screamed until his voice box was literally burned out. I took the cat/jerboa thing with me to safety and fed it some catfood.
In another lucid dream I was walking down an ally at night. I saw this human mutant. It had a keywind thrusted into his back which caused a wound that seemed to be untreated. It also seemed to suffer from scoliosis so much it had a hunchback. Its feet were weirdly long with rotting nails. His eyes seemed bright and round with no features other than eyewhite. He was thin and so pale I could see his veins. He was entirely naked as well.
I caught him climbing out of a child's bedroom holding a bag that was moving. From inside the bag I heard muffled screams of panicking children.
The mutant glared at me and said: "Take whatever pleasure whilst you can."
Let's just say somebody got crucified that night and it wasn't me.
Another one is when I saw the same abomination but in greater numbers. So I thought someone was creating them. Wherever I was, it was being turned upside down by these creatures. They ruined anything or anyone in their path. After killing a few, I decided to follow one who seemed to be taking back some loot to wherever he came from. He crawled into an hole that lead to their base. Where I saw a lot of machines that looked like incubators. In these machines I saw these mutant babies. I kept following the mutant, who was hurrying off into the next room. I figured he didn't at all notice me, as the fool left the door open behind him. I tiptoep my way after him. When I ran into the room, it was dark as night. Something closed the door behind me and it was silent for a few moments. Then I saw a vague figure light a match, which gently lit up the room. Then I heard the gnawling of a lot more of these mutants. They crawled closer to me. The man with the match laughed and said: "Those who cannot rule... destroy!" I spoke to him: "There is no strength in numbers, I've no such misconceptions." I ran into one mutant, tackling him and knocking back everyone who was behind him, including their master. Their master was impaled with the keywind on one the back of one of those mutants. I spoke to him again: "Those who thread the path of evil will face justice eventually." On which he replied, while suffocating on his own blood: "Your pursue is endless, war is the balance between evil and good. You cannot win... Without evil, the good will become corrupted. To exterminate evil, you must exterminate humanity along with it... Death isn't punishment nor justice, it's salvation." At which moment he dropped his match, slowly setting fire to the rug that was on the ground. I saw the mutants cowering in corners. I decided to leave the cave and let their master burn alive along with the mutants and all the incubators. The mutants that were outside at the time fell helplessly to the ground when their keywind stopped running.
I'm sorry if this is too warped.
Hope it was enjoyable.