Pretty Sammy/Headscratchers

• Having seen the show. I have always wondered what was exactly "Pixy Misa". At first I tough it was a brainwashed Misao.But later episodes made clear to me, that she was more along the lines of "A Darker Me".I might be over thinking the show (considering the fact that it is a parody) Tough I wonder if Misa was simply a Misao without a "mask".There are reasons to believe that she expressed her dark side trough Misa .Tough I am not sure.
• At the last episode when Misao becomes Misa again. I had the impression that now Misao was in control full control of her other persona.(Remembering the fact that she couldn't remember being evil after that.)I wonder if that was the case.Or simply "another person took control".