I disagree with endolex: Planescape made it quite hard to judge the intentions of multiple companions including the first one
First off, Planescape: Torment was designed intentionally to go against the grain in every possible way. And the 'reveals' about your companions all were the same thing: They had prior history with you, which only works when you're the Nameless One. This is relatively easy to do if you only have a few companions to begin with, and a protagonist that has lived many, many lives. In a more "normal" RPG, it's hard to pull this off with a similar payoff.
Also, said reveals did not fundamentally change who your companions were. Dak'kon didn't suddenly become a different personality, nor did Morte, nor any of them. What they presented when you met them was pretty much what you could expect later in the game. A floating, wisecracking skull. A stoic Gith'Zerai. An intellectual, chaste Succubus. And so on.
