After being shortchanged in Avengers: Infinity War with the rest of the OG Avengers, Bruce Banner gets his moment to shine in Avengers: Endgame when plays a crucial part in the team’s quest to save the universe. Not only does he achieve his dream of never having to worry about the beast within him but Bruce brings it upon himself to endure the price of bringing back the all snapped creatures of the universe. The price being the decaying of his arm due to the immense energy of the gauntlet. According to the Russo brothers, this damage is permanent.
He’s lost an arm. He lost Natasha. That’s not coming back. He’s damaged himself. I don’t know. It’s interesting. That’s permanent damage, the same way that it was permanent damage with Thanos. It’s irreversible damage. His arm, if you noticed, is a lot skinnier. It’s blackened. So, he loses a lot of strength there.
The biggest question for Bruce moving forward is how this affects his human form. The damage of the snap essentially ended the life of Tony Stark. The only thing that might be keeping Bruce alive is his Hulk form. This makes me wonder if Bruce gets outfitted with an armor similar to his Marvel NOW! appearance from several years ago.
But who knows? There’s a lot of smart people left. Maybe someone helps him repair that. Maybe someone gives him a new arm. I have no idea where that character goes from here. The nice thing is we didn’t have to pay attention to where it goes after this, we just try to tell a satisfying ending.