Animals should go in Category:Fictional animals. Aliens should go in Category:Fictional extraterrestrials. Robots, the undead, supernatural creatures, mythological creatures, and what-have-you should go here.
This category has the following 6 subcategories, out of 6 total.
Pages in category "Fictional nonhumans"
The following 40 pages are in this category, out of 40 total.