Perhaps they start off as rivals at first. Bruce might be a bit suspicious of Barry's powers and his more light - hearted approach. But as they get to know each other better, they realize they can learn a great deal from one another. Barry could teach Bruce to loosen up a bit, while Bruce could show Barry how to be more strategic in his superhero work.
Well, one key plot point could be how Bruce Wayne first comes to the decision to adopt Barry Allen. Maybe Barry is in a tough situation, like being an orphan or in danger, and Bruce's sense of justice and his own orphan past drive him to take Barry in. Another plot point could be how Barry adjusts to living with Bruce. He might struggle with Bruce's strict rules and training regimens at first, but gradually come to understand their purpose. Also, there could be a plot point where Barry discovers his super - speed abilities while under Bruce's care, and Bruce has to figure out how to help Barry control and use his powers for good.
One idea is that Barry discovers a time - related threat that has the potential to erase Bruce Wayne's past, which in turn would change the present Gotham City. They have to race against time (literally for Barry) to stop this threat. Another could be that a meta - human is stealing high - tech equipment from Wayne Enterprises and using it for evil purposes. Barry and Bruce work together to track down this meta - human and retrieve the stolen tech.
The adoption would have a profound impact on the DC Universe. Firstly, in terms of storylines, there would be a whole new set of arcs centered around Bruce and Barry's relationship. For example, how Bruce helps Barry master his powers while also dealing with his own issues. Secondly, it could change the way the superhero community views family. If Bruce can successfully adopt and mentor Barry, it might inspire other heroes to take in proteges. And finally, it could affect the balance of power in the universe. With Barry having Bruce's support, he could become a more dominant force in battles, which might force villains to rethink their strategies and alliances.
Barry Allen's death in the comics is a complex situation. Sometimes he does die, but often there are plot twists and resurrections as part of the ongoing comic narrative. It all depends on the creative direction of the writers and the demands of the story at that time.
In certain comic versions, Barry Allen is indeed identified as Jewish. This aspect is sometimes incorporated into his character background and story arcs.