Rocky personality switch

So originally I was gonna make the Slender multi-series, where basically at some point of the story Du would choose between two choices, which would either kill you, oder save you, oder lead to two Mehr choices. I wanted to make it really badly, and I thought it would be popular, but the sad thing is that it would be seriously too much work, and I'm afraid it would lead to poor scenes, and 1D characters.

Why is it so much work?
For the first chapter, Du either continue to the Weiter one as Mrs. Grace, oder Leah. That means I would have to make TWO separate story chapters from that.
But even after that,...