Giving a role through Gui? [Kinda Complex?]

Hello, So I am making a third-person shooter game, I've made the round intermission system which gets all children and teleports them to the lobby and the game so how do I give a specific player a role in which the system doesn't teleport him, why you may ask? because if a player doesn't want to play he can click the "menu" button and a Gui pops up and he can configure his stuff or whatever I had the idea of a role or something in which a role is given to a player the system ignores the player with the role, and if the player exits the GUI the role get removes, here is the round system:

--Simple round script by LizardV2

--Each player is placed slightly farther from the last
local m_bIncrementLocations = true
--Teleports all
local m_bTeleportAll = true -- too lazy to work on this

local m_iTimerLength = 10 --Round length in seconds
--Middle time
local m_iBreakTime = 40 --Intermission

Model = script.Parent
ActiveRound = Model.ActiveRound
RoundTime = Model.RoundTime
IntTime = Model.IntermissionTimeLeft

IntTime.Value = m_iBreakTime

function m_fnHandleTimer()
	if (ActiveRound.Value and RoundTime.Value > 0) then
		RoundTime.Value = RoundTime.Value - 1
	end
	if (ActiveRound.Value and RoundTime.Value <= 0) then
		RoundTime.Value = 0
			Model.IntermissionTimeLeft.Value = m_iBreakTime
		ActiveRound.Value = false
		for i, player in ipairs(game.Players:GetChildren()) do
			max = Model.LobbyBricks:GetChildren()
			randomlocation = math.random(1,#max)
			m_fnTeleportTo(max[randomlocation], player, i)
			
		end
	end
end


ActiveRound.Changed:connect(function(NewValue)
    if (ActiveRound.Value == false) then
		while(Model.IntermissionTimeLeft.Value > 0)do
			wait(1)
			Model.IntermissionTimeLeft.Value = Model.IntermissionTimeLeft.Value - 1
		end
		RoundTime.Value = m_iTimerLength
		ActiveRound.Value = true
		Model.IntermissionTimeLeft.Value = 0
		for i, player in ipairs(game.Players:GetChildren()) do
			max = Model.GameBricks:GetChildren()
			randomlocation = math.random(1,#max)
			m_fnTeleportTo(max[randomlocation], player, i)
		end
	end
end)

function m_fnTeleportTo(Part, player, i)
  		if player.Character and player.Character:FindFirstChild("HumanoidRootPart") then
			if (m_bIncrementLocations == true) then
     			player.Character.HumanoidRootPart.CFrame = Part.CFrame + Vector3.new(0, i * 5, 0)
			else
				player.Character.HumanoidRootPart.CFrame = Part.CFrame
			end
   		end
end

function m_fnHandleActiveGame()
	if (ActiveRound.Value == true and RoundTime.Value == m_iTimerLength) then
		for i, player in ipairs(game.Players:GetChildren()) do
			max = Model.GameBricks:GetChildren()
			randomlocation = math.random(1,#max)
			m_fnTeleportTo(max[randomlocation], player, i)
			
		end
	end
end

--Run every second
while wait(1) do
	m_fnHandleTimer()
	m_fnHandleActiveGame()
end