I tend to disbelieve in soulbonds and the ability for individuals to migrate from system to system mostly because it requires faith in order to understand it. As I do not have any specific faith in these unexplained and unproven concepts, I don't involve myself in them or feel terribly critical of those who purport to have such experiences, but don't believe in them either.

Multiple individuals sharing a single brain and body, obviously, is something I do accept since that's the way that I am. But for me individually to accept that one can travel between bodies, visit, or channel fictional characters, I would need to believe in the concept of a soul, which I do not.