Well, he might encounter alternate versions of his friends and foes. For example, he could find a different Batman or Joker. Maybe he'd have to adapt to a world with different rules and power dynamics.
Well, perhaps the plot could revolve around Bruce's struggle to contain the chaos the Flash Point Joker brings. The Joker might be causing mayhem in a way that's different from the regular Joker. Bruce has to adapt his strategies, and in the process, he might learn some dark secrets about his own city or himself. It could also involve a psychological battle as Bruce tries to outwit the unpredictable Flash Point Joker.
Often, in fanfiction, a common plot is that Naruto uses the Final Flash to save his friends in a dire situation. Maybe his friends are trapped by a powerful enemy's jutsu, and the only way to break through is with this powerful attack. It could also be a plot where Naruto teaches the Final Flash to one of his students, like Boruto, and how that changes the new generation's fighting capabilities.
In a fanfic, their dynamic might be more extreme. The Flash Point Joker could be even more unhinged and unpredictable than the normal Joker. Bruce, on the other hand, might be more desperate to stop him quickly as the Flash Point changes could mean more dire consequences. So, it would be a more intense and urgent relationship compared to their usual cat - and - mouse game.
Bruce might be a person known within a certain community or field. Maybe he's a well - known troublemaker in the visual arts world who has a habit of disrupting visual stories. Or he could be a new person in a team who, for some reason, is causing a blockage to the visual story without realizing it. For example, if it's a digital art project, Bruce could be a novice who doesn't understand the software well and is making mistakes that are affecting the visual story.
Perhaps Vegeta Jr could challenge Vegeta to a sparring match. Vegeta, being the proud warrior he is, would accept. During the fight, Vegeta Jr might display some new techniques he's developed, which could both surprise and intrigue Vegeta. And in the end, they could form a stronger bond as they realize they share the same values and goals as Saiyans.
Since we should avoid the 'lemon' aspect which is often not appropriate, in general Vegeta is usually depicted as a strong and proud character. He might be shown as a mentor - like figure to Pan in fanfiction. Pan, on the other hand, is often a curious and energetic character. In non - inappropriate fanfictions, their relationship could be one of mutual respect and growth, with Pan looking up to Vegeta for his power and experience.