How do I add a different prefab for play

I’m trying to make a shooter game with Unity and Mirror, but I would like player 2 to have a completely different prefab to player one. This means whoever will be player 1 will always have the player 1 skin, and whoever is player 2 has the player 2 skin. I have no idea on how to do this and any help would be appreciated. Thanks!

Sorry with the title I accidentally pressed enter. How do I add a different prefab for player 2?