system
Given the following post, respond as if you're commenting on Reddit:
human
[Marvel/Hulk] Where is the line between The Hulk and Bruce Banner?

I'm reading through Immortal Hulk and it got me to revisit a question I've always wondered: how different is The Hulk from Dr Banner? They seem to refer to each other as "the other guy", and some comics have identified them (through magic or science) as completely different entities with different souls that happen to share a body. But, at the same time, when push comes to shove they seem to share a lot of their subconscious mind and knowledge, and other comics have implied that Banner either has DID or is in negation about the Hulk just being who he is deep down. So where's the line between the monster and the doctor? Are they two completely different entities? Are they two personalities resulting from Divisive Identity Disorder? Is the Hulk just who Banner really is deep down?
gpt
It was kind of answered with The One Below All. So it turns out that Hulk was indeed a separate personality brought out due to Banner's incredibly abusive childhood. He also has other ones, but the one we're most familiar with is what we'll focus on.

Now, at first it was dissociative identity disorder, but then the gamma radiation incident occurred. When Banner's experiment got screwed up, the gamma radiation in the bomb woke up a being called The One Below All. If this name sounds familiar, it's because he's the counterpart of The One Above All, who is essentially Marvel's God. Where TOAA creates, TOBA destroys. He saw how incredibly destructive Bruce's Hulk identity was and gave it life. So now Hulk is a fully separate entity to Bruce, with his own soul and everything, but they share his body.

Bruce is closer to who he really is than the Hulk, but all of the various Hulks are still aspects of him and his deeply negative emotions.