The BigBad in this troper's Original Fiction is a HumanoidAbomination who likes killing people for absolutely no reason. When he doesn't do that, he enjoys drinking tea, even the FBI members who are out to catch him. He even bakes a cake (a very, VERY delicious cake) for one of the investigators who hates him the most.

The character Epitome, who also goes by the name of Riddely. falls into this trope. Most people remember him for his politeness and calm demeanor, along with his PerpetualSmiler nature. A good example of LightIsNotGood.

In This troper's original fiction, a reoccurring villain is a HitmanWithAHeart who was hired by the GrimReaper to reap the immortal soul of the protagonist, he's quite good at it, and actually keeps up with an angel in close combat, and leaves once his employer is defeated. What does he do when he's not working? He's planning a birthday party for his daughter

I've roleplayed online with characters like this. The best example would be Manfredshould that pothole to BlueAndOrangeMorality? It's hard to tell, with him., who despite being a rapist, considering robots, androids, and other artificially created beings (except POSSIBLY clones) somehow "lesser" by their artificial state (which is ironic for a Golurk, and rather sets off one of my own characters, whose adopted son is an android), and indeed having raped, tortured, dismembered, and murdered two androids for an unknown period of time, is generally polite to just about everyone, including his enemies.

In one of my fictions, the Lord of the Abyss, Craefr is arguably one of these. Yeah, he's a giant demon king that controls all of the elements and whose goal is to TakeOverTheWorld, but he rather respectful to his subjects and cares very much about his children (except for the one whose constantly trying to kill him... for obvious reasons).

A guy who expressed desires to kill me was very nice about it. He bought me lunch and everything.

I love these guys! For one example, there's an original character in a ''Anime/FullmetalAlchemist'' {{fanfic}} who considers the other homunculi to be her "family" and even adopted Wrath. Of course she still happens to be a vindictive PsychoForHire who's more or less ChaoticStupid Neutral, or ChaoticGood on a good day.