I mean, I am quite sure people do that. Even so, when I think of doing it myself I am reluctant. It's as if I am using how I perceive a human being I really know in my own way. As such, I may miss out on a spectrum of aspects that exist - and nonetheless offend the person of the matter. A good reason to do so however, is that you may know so much about a person that you don't need to tediously fledge a realistically feeling personality - it's already there. Even better - it's there waiting to take whatever action you imagine it to take and talk the way you know it's going to talk. How about you?