system
Given the following post, respond as if you're commenting on Reddit:
human
[Marvel][Hulk] What causes Bruce Banner to turn into Joe Fixit rather than the Hulk?

We all know Banner turns into Hulk when he gets angry. What triggers Joe Fixit to show up?
gpt
He doesn't *always* turn into Savage Hulk when he gets angry. He just tends to be the dominant personality.

Bruce has Dissociative Identity Disorder. There's 6 distinct personalties, 5 of which happen to be "Hulks." Joe Fixit seems to show up when Bruce is unsure of himself. He also has a lot more control over Bruce's body when he manifests than Savage Hulk, since he can remain as Joe as long as he wants.