Definitely. Bruce Banner's transformation into the Hulk was the starting point of the entire concept. The comic storylines have always centered around this original transformation and its consequences.
Bruce Banner became the Hulk after a catastrophic gamma radiation incident during one of his experiments. The radiation altered his genetic makeup, causing him to turn into the Hulk whenever his emotional state becomes intense, mainly anger.
Bruce Banner is still alive in the comics. His storylines have many ups and downs, but death hasn't been the ultimate fate for him. He keeps coming back stronger.
The separation of the Hulk and Banner varies in Marvel comics. Sometimes, external forces or internal conflicts cause them to split, but it's not a consistent occurrence throughout all comics.
Bruce Banner's age in the comics isn't fixed. It can range from his 30s to 50s, depending on the creative direction of each comic series and story arc.
In fanfiction, Bruce is often portrayed as the brains behind many of the Avengers' strategies. His scientific knowledge is invaluable. At the same time, his struggle with the Hulk can be a source of both drama and humor. For instance, there might be scenes where he accidentally turns into the Hulk at the wrong moment, creating chaos but also a chance for him to show his strength.
Perhaps in a fanfiction, Bruce Banner discovers a new form of science that can enhance Thor's powers even more. Thor, in turn, helps Bruce understand the Asgardian view of the universe, which gives Bruce new insights into his own work. This could lead to a series of events where they team up against a common enemy that is a threat to both Earth and Asgard.