I seem to have a recurring problem with the Connor series in that there simply aren't enough strong female characters.
Given the massive headaches you already have to deal with, this one may be something you simply lean into / roll with.
That's what Tylenol is for. ![]()
I think the best solution is for Connor's former companion to come to Earth in her glorified body. While there is nothing in Scripture that says humans would ever do that, it would be less offensive than adding yet another reincarnated being.
If I were to make it Dr. Lombardi, then she's in the story from book one, and I can make her a more prominent character, dropping hints that she's more than she seems. Although it would be odd that she and Satan didn't recognize each other as supernatural beings, especially since she would look the same as she did when she lived millennia ago (except young again).
The other alternative is to introduce a new character from book two on. Although I wouldn't reveal her true identity until the end of book two or somewhere in book three, she could be there to assist Connor in some TBD way. He wouldn't fully recognize her from his former life because his soul doesn't fully awaken until the end of book two.
I also need to find a meaty role for Romano and Antonio. I may get rid of Antonio permanently after book one.