
I'm in the same boat as Melted Caramel. Most of my dolls are character dolls. To me, they inhabit 2 separate "universes". In the first, they are nothing more than the physical representations of the character, who have all been brought to this new universe together for some reason and are now forced to live in close proximity (This one's for my photo-story crossovers). They aren't "dolls" in this universe. They are their character. I don't technically exist to them.
The other universe, which is kinda just for omake shots, is where the characters are completely aware they are dolls, and usually just call me "Hey! You!" Though, this stems more from the fact that the majority of them are angry teenaged boys than anything. I haven't actually thought about what some of the girls or the more respectful boys would call me. But like I said, this isn't the main universe, so I don't spend a ton of time coming up with situations in this universe.
My big BJD is Kat and Kat is me. She's a splinter of my personality, my muse. She's not really separate from me, but she's distinct. She has her own "voice" if that makes any sense and doesn't sound too creepy, and even though she's a part of me, she still is her own separate character. Bleh, I feel like that makes no sense to anyone, but that's the best way to describe her.
