Hi there! Tis been a while

I've looked through the pages, and I hope I am posting this in the write forum and hopefully not repeating an earlier question, but is there some special formatting required for talking to "a visitor" for lack of a better word.

In my WIP I have one character who has what we'd probably classify as DID, and several others undergo a ritual that involves having a sentient spirit shack up in your body.

But things got messy real fast when I tried having the POVs chat with their embodiments. I figured the experts would know

Currently, I have everything "conversed mentally" in italics, but I am debating if I need quotation marks for any voices that do not belong to the POV. I also rely on dialogue tags to mark who said what. Is this the best way to approach the situation? Or is this all personal preference?

Thanks in advance!