Okay, my job here is to explain what the hell a “Satyr” is in the Lovecraft world-view. It’s like this. In many Lovecraftian tales, it is clear that the human genotype is subject to degeneration or mutation under the influence of the Outside. Sometimes this is done purposefully, as with ghouls (who derive from us), the Deep Ones (who interbreed with us), or Yog-Sothoth (whose hybrid spawn also result from such interactions).
But there are other ways for humanity to become animalistic and vile – in Lovecraft’s tales alone you have the monstrous remains of quadruped humans in the Rats in the Walls, the horrible Martense family from the Lurking Fear, and even Arthur Jermyn. Ramsey Campbell made this trend very clear in his own stories, particularly with The Moon Lens, in which a person is engulfed by an Outside Entity (possibly Shub-Niggurath), and then spat out as a terrifying monster, as well as the Horror Under Warrendown, in which the animalistic horrors renew their numbers by feeding their god’s “fruit” to others.
Basically my theory is that all of these deteriorated, genetic mutations in the various Mythos tales might have a thousand origins, but that in all their variety, they make up the Satyrs which are also mentioned in Mythos lore. So I present these hobbling, chuckling, mowing, and enthusiastic creatures as my carefully-presented analysis of the Lovecraftian Satyr.