Simple Highlight

local Players = game:GetService("Players")
local LocalPlayer = Players.LocalPlayer

local function isHider(char)
	if not char then return false end
	for _,v in pairs(char:GetChildren()) do
		if v:IsA("Model") and v.Name == "MorphModel" then return true end
	end
	return false
end

local function glow(player, yes)
	local h = player:FindFirstChildOfClass("Highlight")
	if yes then
		if not h then
			h = Instance.new("Highlight")
			h.Adornee = player
			h.FillColor = Color3.new(1,0,0)
			h.OutlineColor = Color3.new(1,1,1)
			h.Parent = player
		end
	elseif h then
		h:Destroy()
	end
end

for _,p in ipairs(Players:GetPlayers()) do
	if p ~= LocalPlayer and p.Character then
		glow(p.Character, isHider(p.Character))
	end
end