How to make the character face your Controllers Joystick?

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You can use the CFrame.new(Vector3 pos, Vector3 lookAt) constructor to make the HumanoidRootPart face a direction, which in this case is the (right) thumbstick position.

local UserInputService = game:GetService("UserInputService")

UserInputService.InputChanged:Connect(function(input)
	if input.KeyCode == Enum.KeyCode.Thumbstick2 then
		local position = input.Position
		
		-- If the stick goes 10% past the center, activate
		if position.Magnitude > 0.1 then
			Root.CFrame = CFrame.new(
				Root.Position,
				Root.Position + Vector3.new(position.X, 0, -position.Y)
			)
		end
	end
end)

If you want to rotate it relative to the camera the solution is a bit more complex, but still similar:

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

local Camera = Workspace.CurrentCamera

local function Rotate(vector, angle)
	return Vector2.new(
		vector.X * math.cos(angle) + vector.Y * math.sin(angle),
		-vector.X * math.sin(angle) + vector.Y * math.cos(angle)
	)
end

UserInputService.InputChanged:Connect(function(input)
	if input.KeyCode == Enum.KeyCode.Thumbstick2 then
		local position = input.Position
		
		if position.Magnitude > 0.1 then
			local look = Camera.CFrame.LookVector
			local angle = math.atan2(look.Z, look.X) + math.pi / 2
			
			position = Rotate(position.Unit, angle)
			
			Root.CFrame = CFrame.new(
				Root.Position,
				Root.Position + Vector3.new(position.X, 0, -position.Y)
			)
		end
	end
end)

Note: Both of these examples assume “Root” is the HumanoidRootPart

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