start a game and go to character creation.. while still keeping the game up load up 3 more versions of the game and "join" your first game.. make a character on all 4 clients and press start... exit the game on the 3 other clients and youll keep all the characters for your own use.
that wasn't devs intention, you would end up controlling 4 PC and do all the talkings yourself rather than the feeling of 1 PC and 3 other companions.