Well instead of name every creature that there is, i am thinking of identifying a number of fundamental characteristics that make up all fantasy creatures.
Because after doing some research I quickly realized that putting all the fancy names and histories aside, tons of the creatures were just combinations of a certain number of elements and then it is almost like their history and abilities were tacked on.
So far i've decided on 4 "elements". But keep in mind, this is all just shit i've been thinking up, and you all might feel there are more or less components.
Human, Animal, Inanimate, and Supernatural. I've been looking for good words for the last 2, i don't feel theyre perfect, especially supernatural, but what i mean by those 2 i feel are exactly what i'm looking for.
Every fantasy creature is a combination of those 4 elements. Some creatures are combinations of animals, some are humans and animals, some are combinations of humans, animals, and inanimate components (think elemental animals or humans), and supernatural + human can be a ghost, or an angel, angel could also be seen as animal + human + supernatural, or just supernatural depending on what legend of angel you are talking about. There are animal spirits, which are a combination of supernatural and animal. And there are some creatures which are purely animal, purely human, purely inanimate, and purely supernatural.
I don't like the word inanimate, because i am including in the inanimate category those creatures which don't talk, don't interact with people, but are obviously alive, but they are also made of solid or liquid material, not flesh. An elemental with no human or animal characteristics.
There are creatures which are purely any of the 4, however in most fantasy stories they have like... hints of some of the other 3. Like i would classify dwarves, elves, halflings, gnomes, and what have you as all human. Some legends of dwarves have them also have some inanimate in them. And the particulars of what exactly tolkien-esq creatures are, are probably things tolkien fans would like to debate with me on, and quite frankly i'd rather run my hand through with a good sturdy steak knife.
But there still leaves the question of magic, and its various forms. Seems to me that fantasy does not differentiate that much between psionics and magicians. I could say all magic, from psionics, to magicians, to the vaguely pagan powers of druids are all a touch of supernatural, but i feel like that would make like 4/5ths of all fantasy creatures be classified as supernatural in part, so that seems like somewhat of a bad idea.
I am thinking about making 1 mix be their inherent makeup, but also have a second mix for socially learned things. Like in some stories, humans in general are unmagical, but they can learn magic. And some societies are mage societies and they have a complex almost art-like organization of learned magic. But illithid societies are inherently psionic, they dont learn how to be psionic, they are from birth.
Those are some ideas, nothing is set in stone. And also it isn't even organized that well.