How to load a character appearance for an NPC in-game?

I've tried to do this many times, I've looked it up on the wiki, and I actually tried some methods myself. I've found absolutely nothing.

Here's what I made earlier, didn't work at all.

spawn(function()
	while wait(15) do
		local mdl = workspace.CharModel
		local char = game.Players:GetCharacterAppearanceAsync(117099978)
		
		mdl:Destroy()
		char.Parent = workspace
		char.Name = "CharModel"
	end
end)

You might want to look inside the object that the function loads: it's not a self contained character, it's only accessories and meshes.

This function returns a Model containing the assets which the player is wearing, excluding gear.

It doesn't say "Loads the player's character."