Servitor Interview?, Could a method used by fiction authors be helpful when creating entiti Options

This may sound completely stupid but forgive me I'm a noob to all this. (IMG:style_emoticons/default/baby.gif)

I've heard that sci-fi and fantasy authors 'interview' their characters by imagining them sitting across from them in a room and asking questions. The answers are supposed to let you get to the know the characters more.

Could this be useful if you intended to give a servitor/tulpa/whatever a personality? I was thinking about creating a 'friend' servitor just to start out with, and I was wondering if this could help.

And if it could, what would be some good questions to ask?

Yeah short-term servitors with simple tasks is what i'm planning to start out with. Maybe a ball of light or something easy to visualize could be the form of that. But once I'm used to that I'd like to try something along the lines of the "Phillip Experiment" which would require more detail on the thing itself. If I practice for a long time and become really confident in my abilities a David-Neel type Tulpa would be my ultimate goal but I know I'm far from doing that right now.
Thanks for you help I'll try something simple maybe keep a blog of how it goes.