Potential

local uis = game:GetService("UserInputService")
local adornments = {}
_G.Enabled = true

local function makeAdornment(part)
    local adornment = Instance.new("BoxHandleAdornment")
    adornment.Adornee = part
    adornment.AlwaysOnTop = true
    adornment.ZIndex = 1
    adornment.Size = part.Size
    adornment.Color = BrickColor.new("Bright green")
    adornment.Transparency = 0.3
    adornment.Parent = part
    table.insert(adornments, adornment)
end

for i,v in pairs(game:GetService("ReplicatedStorage").Player:GetDescendants()) do
    if v:IsA("MeshPart") or v:IsA("Part") then
        makeAdornment(v)
    end
end

for i,v in pairs(game.Workspace:GetChildren()) do
    if v:FindFirstChild("Head") then
        for i,v in pairs(v:GetDescendants()) do
            if v:IsA("MeshPart") or v:IsA("Part") then
                makeAdornment(v)
            end
        end
    end
end

uis.InputBegan:Connect(function(input, gp)
    if not gp and input.KeyCode == Enum.KeyCode.V then
        _G.Enabled = not _G.Enabled
        for i,v in pairs(adornments) do
            v.Transparency = _G.Enabled and 0.3 or 1
        end
    end
end)