I'm trying to find the best way to describe being so physically deformed, that its only, somewhat recognizable, feature is its own body shape. Mutant doesn't work for me, as it implies the reason of deformation, and I need something more general. Freak seams right, but sounds silly to me, so I hopping for something else. I was thinking about word chimera, but I'm not sure if it's the right way to use it.
Also, I don't care how offensive the word is. Thank you.
The word you are looking for is gargoyle.
Although coined in connection with carvings and sculptures (grotesquely carved waterspout), Gargoyle can be applied to a person with a grotesque appearance.
An intriguing word is invunche, a monstrous human creature from a disturbing South American legend. One of these can be seen on youtube - you don't forget the image easily after reading the legend.
How does aberration or anomaly sound to you?
A person who is felt to be particularly cruel, brutish, or hideous.
There's always your grotesque of course (n. & adj.). I you happen to be in need of something more neutral, you can settle for mangled, and to remain perfectly objective, you can go with disfigured.
