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Antagonists can be fun to write. Yet, to be good foils for your protagonists, they need depth and layers. They need logical reasons to oppose the story’s main character. Write worthy antagonists.
Fiction characters both on screen and on the page require lives of volatility and change and conflict. They need anything but peace. They need events intruding and messing up their plans. They need other characters to challenge them, to put obstacles in their paths. They need confrontation and trials. And they need to take risks.