private void Update(){
    //assumes class has a float "XSensitivity", CharacterController "controller", and Quaternion "characterTargetRotation"

    Vector3 fwd = this.gameObject.transform.forward * Input.GetAxis("Vertical") * speed;
        Vector3 rgt = this.gameObject.transform.right* Input.GetAxis("Horizontal") * speed;
        Vector3 move = (fwd + rgt);
        characterTargetRotation *= Quaternion.Euler(0f, Input.GetAxis("Mouse X") * XSensitivity, 0f);
        this.gameObject.transform.localRotation = characterTargetRotation;
        controller.SimpleMove(move);
}