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Have a look around for the AD&D 2nd Ed. Monstrous Compendium (or whatever the current equivalent is under their new rules), which listed hundreds of possible monsters (I think there were severa...
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Source: https://writers.stackexchange.com/a/3564 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
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Have a look around for the AD&D 2nd Ed. Monstrous Compendium (or whatever the current equivalent is under their new rules), which listed hundreds of possible monsters (I think there were several of these books). Easy enough to get ideas from these, or other RPG books. For my own part, I tend to scour around for books on myths and legends from countries around the world, as they're a great source of inspiration when it comes to gods, spirits, demons, and monsters. Alternatively, look at nature, and make up your own monsters based on the weird and crazy creatures that exist in real life. Believe me, there's enough of them!