Just a few brief notes on each for now; as promised, they'll all get their own posts eventually. As per the name, they all have cloven hooves for feet, but unless this is specifically mentioned in their entry then it's going to be quite subtle; not full-on goat legs, literally just hooves where you'd maybe expect feet.
Into: suffering, pain, torture, convincing lesser beings to carry its babies
Manifests as: gargantuan gray blob with thousands of mouths and hooves; each of the mouths speaks when it talks, all saying something subtly different
Into: the fundamental fragility of matter, entropy, elaborate ritual sacrifices
Manifests as: 20 foot tall ape-like creature covered in weeping sores and a head every orifice of which oozes black sludge
Into: the alien unknowable terror of nature, Byzantine plots that take centuries to unfold, kidnapping kids and replacing them with doppelgangers
Manifests as: naked old Venusian man from whom sprout innumerable grotesque thorns
Into: secret knowledge, frenzied sex rites, doing drugs
Manifests as: Goat-headed goat-legged Earthling man, jacked like a bodybuilder
Into: bugs, plague, overseeing the Slime Hive
Manifests as: beautiful Venusian woman whose body is covered in holes in and out of which buzz millions of flies, wasps, bees, etc.
Into: mutation, the ultimate randomness of the cosmos, drowning people
Manifests as: giant half-goat half-squid that lives in a slimy black lake