How do I create multiple enemy appearances without lots of prefabs?

I would like to create multiple looks for enemies (zombies) so they don’t all look the same.
Each model is created in Blender and is rigged using Mixamo which creates the rig as a separate object.

Is there a way to have multiple looks for the enemy without having lots of prefabs?

Building Character Customization (Part 1) | Under the Weather Software Check this out, there is also a part2 on the bottom. Hope it helps.