Board Thread:Anime/Game Discussion/@comment-8851503-20190414110237/@comment-44094354-20200305211217

Unforgiven0815 wrote: KoichiSa wrote: I don't if I'm the only one to think like this, but... I think Diavolo and Doppio are not two different personalities of the same person. Rather they are two different souls residing in the same body. It might sound weird but as we can see, after Doppio's(also Diavolo's) and Bucciarati's souls were switched, Doppio remained in Bucciarati's dying body and eventually died. On the other hand, Diavolo left the body of Bucciarati.I think that's only possible if they're separate souls. Although it's possible that what everyone else say(they're actually split personalities) is true. So I respect what you guys think.

If that's the case, why couldn't Doppio leave Bucciarati's body as well? Diavolo being the only one who managed that only speaks further for Diavolo not being a "full" soul, rather like a parasite/devil, latching itself onto another person. Aside from the fact that the priest named him Diavolo, it's highly possible that Diavolo is a Devil/Parasite living in the body of Doppio, like.... Even if they're really just personalities,I don't think two personalities of a person can act at the same time.As we can see, Diavolo commands Doppio during his fights or when he gets into critical situations. AlsoDiavolo can leave a body behind, while the other one can't.

Although It's also possible that, Doppio couldn't leave the body because Doppio doesn't really know that the soul of his Boss is also living inside that body. He considers himself only one whom their body belongs to and thus considers himself inseparable from the body. That's why he didn't even think that it was possible for him to leave.