Sometimes my thoughts are in the voice of a man with a strong southern accent.
However, that may be because, if I were to have a second identity, it would be a male. Sometimes, I am utterly convinced that I was born into the wrong body.
I'm american, and the voice in my head is mostly British. Sometimes, however, it's Morgan Freeman (when I'm feeling philosophical) and at other times it's Robert Downey Jr. (I have no clue why).
It's normal, probably has some deeper meaning to it though. Could be your body's way of telling you you're lonely. Okay now I sound like Sigmund Freud...nevertheless it is a possibility.
It depends. My conscience rarely seems to be my own voice. For the most part, it appears to be "unisex". There have been times where it sounded like a guy,though.
Normal. I use quite a lot of accents and famous voices in my head. For females, the Southern drawl of Sookie Stackhouse is my most popular choice...and yes, I'm doing it now.