thanks for this tips

What makes a character so special is all the lore behind it. And so with the enemies. It is my believe that giving the necessary relevance to these characters will make the story greater. Maybe in your case it could be interesting to find out why in this universe the enemies are "the enemies" indeed. Because it sounds amazing when the user does not recognize who is the bad guy in the story.

They always say that your hero is as good as your villain. If you're into world-building, you need to research how to establish the problem of your chosen world has been experiencing. It's good if it can reflect real-world problems such as corruption and tyranny.