Denizens and Imps of The fourth dimension

This is pretty much a book of these things I thought of called Denizens and Imps. They are both from The fourth dimension. Denizens are usually not harmful to humans in any way, and actually intended on doing the contrary, despite they're unsettling appearance. They are able to connect to the third dimension, our dimension, and most if the time, think of humans as pets or something like that, and usually have one or multiple sleceted humans that they protect and watch over. Sometimes, they watch over humans for generations, like if someone's parent and/or grandparent had a Denizen, they're descendent might have the same one. One race of the Denizens that have watched over humans for millions of years, are 'Mothmen' (I don't actually take this seriously and you shouldn't either) they have pretty muchwatched over humans since they evolved from apes. They are typically black and/or gray beings and sometimes will have dull colors like brown or red.
Imps are beings that despite sometimes looking for like humans then Denizens do, want to mentally kill humans and sometimes succeed, if they are no stopped by the humans Denizen. They look kind of like dooby from harry potter, only pitch black skin or dark gray skin, no clothes, and horrifying grins.
I have personied some of both.