There's a canon "Gorion's Ward", but it doesn't mean that what happened to Gorion's Ward in BG1 and BG2 is at all canon. In any of the endings of Throne of Bhaal, Bhaal is dead and gone forever. That's obviously not how things actually shake out.
Not only is there a canon protagonist from BG 1+2, the events of the games, including expansions, were also made canon. And where the game offered choices there is either a canon choice (Thief guild instead of vampires) or the choice is not recorded.
