So, if you play tower defense simulator, you know that when you move your mouse when you have a tower, it moves in a sway movement, I made something similar to this Character Sway Effect which I customized and made it so that it works with regular rigs, here is the script and what to do
-- LocalScript inside StarterPlayerScripts
local RunService = game:GetService("RunService")
local TweenService = game:GetService("TweenService")
local UIS = game:GetService("UserInputService")
local plr = game.Players.LocalPlayer
local mouse = plr:GetMouse()
local mainPart = workspace.Rig.HumanoidRootPart
mainPart.Anchored = true
mainPart.CanCollide = false
mainPart.CanQuery = false
mainPart.CanTouch = false
mainPart.Size = Vector3.new(1,1,1)
mainPart.Parent = workspace
local oldCFrame = mainPart.CFrame
local rad = math.rad
local Camera = workspace.CurrentCamera
local function MouseRaycast(Blacklist)
local MousePosition = UIS:GetMouseLocation()
local MouseRay = Camera:ViewportPointToRay(MousePosition.X, MousePosition.Y)
local raycastParams = RaycastParams.new()
raycastParams.FilterType = Enum.RaycastFilterType.Blacklist
raycastParams.FilterDescendantsInstances = Blacklist
local RaycastResult = workspace:Raycast(MouseRay.Origin, MouseRay.Direction * 1000, raycastParams)
return RaycastResult
end
local MouseRaycastRig = MouseRaycast({workspace.Rig})
-- tweakable variables
local tweenInfo = TweenInfo.new(.5,Enum.EasingStyle.Sine) -- the more time, the slower and smoother.
local offset = Vector3.new(0,1.7,0) -- can be used if reaching too high or too low
local sway = 150 -- sway multiplier
RunService.Heartbeat:Connect(function()
local Result = MouseRaycast({workspace.Rig})
if Result and Result.Instance then
if not mouse.Target then return end -- return if mouse is in the sky or smth
local cFrame = CFrame.new(Result.Position.X + offset.X, Result.Position.Y + offset.Y, Result.Position.Z + offset.Z)
if cFrame ~= oldCFrame then -- If the part has actually moved
local m = cFrame.Position - oldCFrame.Position -- magnitude
local angle = CFrame.Angles(rad(m.Z*sway),0,rad(-m.X*sway))
cFrame *= angle
TweenService:Create(mainPart,tweenInfo,{CFrame = cFrame}):Play()
oldCFrame = cFrame
end
end
end)
I customized my rig size but in order to work properly, you must find the size of the legs of the rig, ( I used a part and saw the Y value on size) and change the middle value of the offset. (Y for beginners 
) If the humanoidrootpart is not a member of rig, then start and put your cursor in like the middle of the screen, you can customize this if you want it to place but that’s all for this idea of mine.