Ugh. This is disappointing. The fact that you control the personality of two characters is probably what bugs me the most about the game (having only barely touched it though). I like having companions, but not controlling the personalities of more than one character. I don't play rpg's for the roleplaying aspect. Therefore, when controlling two personalities, they just mirror each other, and it's lame as hell. I've tried branching out a little with one character, but it just feels forced and pulls me out of the experience. I think I should just wait to play the game for someone to mod in the possibility to start with a single character.
How does it work in multiplayer? Do both players start with two characters each, or only one each?