[quote=KatherinWinter]
Not now not ever. I have never understood exactly what they areAre they like Dr. Jekyll and Mr. Hid? Because then they would have little to no knowledge of each other, but they seem to be more like split personalities with knowledge of each other but if that was the case they wouldn't look different.
[/quote]

No, they are like Dr. Jekyll and Mr. Hide. They share a mind, and have two bodies though they have their own traits and likings. My inspiration for the two of them came from Host. (A book) 

It is very confuzzling if I do say so myself. But I understand it because I am crazy enough to know my own creations.