Passing parameters from Script to MainModule?

Hey guys,

so before I asked a question regarding my MainModule to assign certain Avatars via a specific function, which turned out to not work due to a wrong event. Now, I'm trying to pass a parameter from my Script (In this case "plr" and "char") to the MainModule, so it can set the parent of certain items to the player's Character. I tried several things, I even tried to just put the parameters from the script in the MainModule's function, but without any succes. Here's my code:

SCRIPT

local Global = require(game.ServerScriptService.GlobalHandler)


game.Players.PlayerAdded:Connect(function(plr)
	--Create Avatar 
	if not plr:FindFirstChild("avatar") then
		local value = Instance.new("StringValue")
		value.Parent = plr
		value.Name = "avatar"
	end

	--Avatar Customization
	plr.CharacterAdded:Connect(function(char)
		local avatar = plr:WaitForChild("avatar")
		if avatar.Value == "guitar" then
			Global.GuitarAvatar()
		elseif avatar.Value == "hank" then
			Global.HankAvatar()
		elseif avatar.Value == "secretary" then
			Global.SecretaryAvatar()
		elseif avatar.Value == "princess" then
			Global.PrincessAvatar()
		end
	end)
end)

MAINMODULE

local Global = {}

--Variables
local rs = game:GetService("ReplicatedStorage")
local gdhats = game:GetService("ServerStorage").GuitarDude


--Tables (Shirt, Pants, Face)

GuitarClothes = {"http://www.roblox.com/asset/?id=398635080","http://www.roblox.com/asset/?id=382538502","rbxassetid://1016181246"}
GuitarHats = {gdhats.BackGuitar, gdhats.Bandito, gdhats.CheeseHat, gdhats.Necklace}


--Functions

function Global.GuitarAvatar()
			wait(1)
			--Accessories
			for i,v in pairs (char:GetChildren()) do
				if v.ClassName == "Accessory" or v.ClassName == "Hat" then
					v:Destroy()
				end
			end
			
			GuitarHats[1]:Clone().Parent = char --"Unknown global 'char'"
			GuitarHats[2]:Clone().Parent = char
			GuitarHats[3]:Clone().Parent = char
			GuitarHats[4]:Clone().Parent = char
			
			--Face
			char.Head.face.Texture = GuitarClothes[3]
			
			--Shirt
			if not char:FindFirstChild("Shirt") then
				local shirt = Instance.new("Shirt")
				shirt.Parent = char
				shirt.ShirtTemplate = GuitarClothes[1]
			else
				local shirt = char:FindFirstChild("Shirt")
				shirt.ShirtTemplate = GuitarClothes[1]	
			end
			
			--Pants
			if not char:FindFirstChild("Pants") then
				local pants = Instance.new("Pants")
				pants.Parent = char
				pants.PantsTemplate = GuitarClothes[2]
			else
				local pants = char:FindFirstChild("Pants")
				pants.PantsTemplate = GuitarClothes[2]
			end
end


--Events
rs.respawn.OnServerEvent:Connect(function(player)
	player:LoadCharacter()
end)


return Global

Any tips on how I get rid of the "Unknown global 'char'" warning, and setting the proper parent would be appreciated!