I was reading Ultimates vol 2 today (although this question applies to any version of the character) and something happened that got me thinking. For those unfamiliar with the series, originally Bruce Banner held a lot of animosity towards Hank Pym for taking his position as Number 1 researcher in SHIELD and continually showing him up at work. Hank Pym was actually a big part in what led to Bruce becoming the Hulk for the first time (or technically, the second time) and as Hulk, he made it quite clear how much Banner hates Pym.
Now the story has jumped ahead 1 year, and Bruce and Pym are actually partners. It seems Bruce has forgiven Pym -- okay fine, that makes sense. But then I thought, since Hulk made it so clear how much he hated Pym, has HE forgiven Pym just because Banner did? If Bruce were to transform, would Hulk still be able to hate Pym? Perhaps if Bruce still had deep seeded, unconscious resentment, it could manifest itself as the Hulk, but let's just assume that Banner doesn't have any resentment left. Let's just assume that Banner is literally 100% cool with Pym now; does that mean Hulk automatically is as well, or can Hulk make his own decisions? Are Hulk and Bruce Banner actually two separate personalities/people, or is Hulk just another side of Bruce Banner?