local function setupNPC(humanoid)
    local character = humanoid.Parent
    if not character or game.Players:GetPlayerFromCharacter(character) then return end
    
    local highlight = character:FindFirstChildOfClass("Highlight")
    if not highlight then
        highlight = Instance.new("Highlight")
        highlight.FillTransparency = 0.5
        highlight.OutlineTransparency = 0
        highlight.Parent = character
    end
    
    local billboard = character:FindFirstChild("NPCHealthDisplay")
    if not billboard then
        billboard = Instance.new("BillboardGui")
        billboard.Name = "NPCHealthDisplay"
        billboard.Size = UDim2.new(4, 0, 1.5, 0)
        billboard.StudsOffset = Vector3.new(0, 2.5, 0)
        billboard.AlwaysOnTop = true
        billboard.Adornee = character:FindFirstChild("Head") or character.PrimaryPart or character:FindFirstChildWhichIsA("BasePart")
        
        local textLabel = Instance.new("TextLabel")
        textLabel.Size = UDim2.new(1, 0, 1, 0)
        textLabel.BackgroundTransparency = 1
        textLabel.Text = "HP: " .. (humanoid.MaxHealth > 0 and math.floor(humanoid.Health) or 0)
        textLabel.Font = Enum.Font.SourceSansBold
        textLabel.TextSize = 18
        textLabel.TextColor3 = Color3.new(1, 1, 1)
        textLabel.TextStrokeColor3 = Color3.new(0, 0, 0)
        textLabel.TextStrokeTransparency = 0.5
        textLabel.Parent = billboard
        
        billboard.Parent = character
    end
    
    if not humanoid:GetAttribute("HealthConnected") then
        humanoid:GetPropertyChangedSignal("Health"):Connect(function()
            local hpText = "HP: " .. (humanoid.MaxHealth > 0 and math.floor(humanoid.Health) or 0)
            if billboard and billboard:FindFirstChildOfClass("TextLabel") then
                billboard:FindFirstChildOfClass("TextLabel").Text = hpText
            end
        end)
        humanoid:SetAttribute("HealthConnected", true)
    end
end

for _, descendant in pairs(workspace:GetDescendants()) do
    if descendant:IsA("Humanoid") then
        setupNPC(descendant)
    end
end

workspace.DescendantAdded:Connect(function(descendant)
    if descendant:IsA("Humanoid") then
        setupNPC(descendant)
    end
end)

while true do
    wait(5)
    for _, descendant in pairs(workspace:GetDescendants()) do
        if descendant:IsA("Humanoid") then
            local character = descendant.Parent
            if character and not game.Players:GetPlayerFromCharacter(character) then
                if not character:FindFirstChildOfClass("Highlight") then
                    setupNPC(descendant)
                end
            end
        end
    end
end