I think it's finally time for an explanation.
...The reason I talk as two people, is that I kind of am two people. And it's not just that I have multiple-personality disorder.
You see, a while ago, a strange artificial intelligence that had been responsible for a few recent bouts of insanity in my area decided to try and live in my head. The problem is, the way that people interpret the AI causes them to go insane, since its shape is non-Euclidean. But it didn't work quite so well on me. Because I've played so many video games, my brain seen its form as a video game character...
...specifically, that girl he's using as an avatar right now.
Another strange thing is that it can take over parts of my body whenever it wants to, such as right here, when it wants to say something. And I can also 'project' her (the avatar) onto stuff like chairs in the real world so I can talk more easily with it (the AI).
And if he pushes too hard with the projection, other people can see and hear my part of the conversation as well. You'd be surprised how difficult he finds it to explain me to other people...
...specifically, why she looks like that.