Honestly, the magical papyri was a product of a multi-cultural, philosophically motivated segment of religion in Late Antiquity. I'm not sure how Roman I would really call it.
The only thing that native Roman religion really has to commend to itself in the way of evil spirits are the Lemures, nasty spirits of the dead that were propitiated with bizarre rituals. But they are just nasty spirits of the dead and nothing more. "Demons and Angels" in the sense that the original poster is using are Christian constructs that are simply not useful in terms of Roman paganism. Christian constructs like good and evil or virtue and sin are not useful either. This was made clear to the original poster in a prior thread. That is why some of us are taking this thread less than seriously.