Update: these people are more real than we think.
We recently watched the TV series, Hannibal, and it’s as good as everyone said - I was impressed by Lecter’s intellect, so briefly invited him to my “Cabinet.”
The result was little short of a disaster, in that he only wanted to advise me to do things which were patently against my own best interests, to kind of wallow around in the darkest, most primal mud of my own psyche, and in no time whatsoever he had begun attempting to manipulate me into actions that seemed to have no purpose except serve his agenda - even though he’s not “real” (this was not an evocation of the character’s egregore, it was a creative act).
So, I withdrew my energy from him and banned him from my cabinet - permanently!
But this was at least a useful demonstration that these beings are very much imbued with the “life force” of their character, and can’t be edited and amended lightly. This knowledge was very useful, and worth the aborted experiment.
I’ll be sticking with Poirot for the brains of the operation - he’s sweet, slightly flirtatious, and altogether not a manipulative psychopath! 
(I know, I know - in other news, water still wet. Duh!
)