But usually I just run solely for feel and a little explanation.
It's why Mister Pig is very obviously a shallow composite between the biblical demon Legion, and a particular gif of a silent French film from 1907. Because pigs and swine have so much negative cultural association in the modern day—being dirty, disgusting, greedy, used as a negative term for police or capitalists or nasty men—to me, that gives a blatant reference to demons a sufficiently nasty feeling.
You've got the biblical demon and its own possible reference to Roman occupation, the modern baggage of pigs being horrible and associated with exploitation and brutality, and the below image all coming together as a thing called Mister Pig. The name is so plain as to seem innocent, I think. So overall Mister Pig is gross and comes across as gross just as a concept.
|From 'Le Cochon Danseur'.|
So it's taking known things and making them more unknown.
A thing that does this badly is Genasi, and the aesthetic and feel of Genasi. Daniel Dean over at Basic Red said it better about how Genasi are taking the unknown and making them known, or at least getting the feel of a creature inherently tied to some element entirely wrong.
The art in particular annoys me, with most examples having fire Genasi have flames in the place of hair, or some art just having them as bald humans with glowing marks on their bodies. And that's not taking the known human form and making it unknown and strange, but just grafting fire onto a human model without thinking of how extensively biology would be changed by being partly made of a combustion reaction.
Like, think of how desiccated they would look, or how melty, or how they wouldn't have skin because meat tissue would literally cook unless the fire was cool or manipulatable. Maybe they wouldn't have fire on their heads near their brains, but across their backs, or maybe their heads are hollow and they have no faces but instead large holes to spit damp ashes and smoke, and their brains are somewhere else in their bodies or spread out down their spines. Because we know how fire interacts with meat and a meat head covered in latent flames just doesn't capture the feel correctly. Have a fire Genasi design built on how we know to contain fire, or feed fire.