For this I need to use this method of the CameraController class?apply it as a rotation to the character's facing direction.
public void Rotate(float horizontalMovement, float verticalMovement)
Yes.You're using a first person view, right?
As I understand it, this method rotates the character itself, and I only need to rotate the camera.although it might be easier to useUltimateCharacterLocomotion.SetRotation(...)
, since that takes a Quaternion.