hitbox expender (head)

local Workspace = game:GetService("Workspace")
local Players = game:GetService("Players")

local function isPlayerCharacter(model)
    if not model or not model:IsA("Model") then return false end
    return Players:GetPlayerFromCharacter(model) ~= nil
end

local function isHumanoidModel(model)
    if not model or not model:IsA("Model") then return false end
    return model:FindFirstChildWhichIsA("Humanoid") ~= nil
end

local function applyToPart(part)
    if not part or not part:IsA("BasePart") then return end
    if part.Name ~= "Head" then return end

    local model = part.Parent
    if isHumanoidModel(model) and not isPlayerCharacter(model) then
        pcall(function()
            part.Size = Vector3.new(4, 4, 4)
            part.CanCollide = false
            part.Transparency = 0.5
        end)
    end
end

local function watchNameChanges(part)
    if not part or not part:IsA("BasePart") then return end
    part:GetPropertyChangedSignal("Name"):Connect(function()
        applyToPart(part)
    end)
end

for _, desc in ipairs(Workspace:GetDescendants()) do
    applyToPart(desc)
    if desc:IsA("BasePart") then
        watchNameChanges(desc)
    end
end

Workspace.DescendantAdded:Connect(function(desc)
    applyToPart(desc)
    if desc:IsA("BasePart") then
        watchNameChanges(desc)
    end
end)