Well, it might be that Bruce Wayne unmasked himself as part of a grand plan to draw out a particular enemy. He could be thinking that by making himself vulnerable, the enemy would come out of hiding, believing they had the upper hand. This would be a very risky move, but Bruce is known for taking risks. And then there could be a lot of drama as the public and the other characters in the story react to this revelation.
Alfred would be extremely worried. He has always been like a father figure to Bruce and would fear for his safety. He might try to convince Bruce to go into hiding or find a way to reverse the unmasking. Dick Grayson, on the other hand, would be shocked at first but then would likely step up to support Bruce. He'd understand the reasons behind it to some extent, having been Robin and knowing the pressures of the superhero life.
A great plot twist could be that Harley Quinn is actually undercover to protect Bruce Wayne from a secret threat that he doesn't even know exists. All her crazy antics are just a cover to keep the real enemy at bay.
One possible plot twist could be that Xander Harris, being Bruce Wayne's son, has a completely different approach to vigilantism. Instead of the brooding and dark style of Batman, he might bring a more humorous and off - beat take on fighting crime in Gotham. Maybe he uses his knowledge from his non - Wayne upbringing to come up with unique strategies.
One possible plot twist could be that Batman is actually Bruce Wayne's long - lost twin brother. They were separated at birth, and while Bruce grew up in the Wayne family, his brother had a different upbringing that led him to become Batman. This would completely change the dynamic between Bruce and Batman.
A great plot twist could be that the wedding is actually part of a much larger plan by a new super - villain in Gotham. This villain wants to use the wedding as a distraction to carry out some major heist or evil scheme. Meanwhile, Bruce and Selina are oblivious to this at first. As they start to notice strange things happening, they have to figure out what's going on while still trying to have their dream wedding.
A plot twist might be that there's some sort of danger related to the pregnancy. For example, an old enemy of Bruce's discovers that Selina is pregnant and tries to use the unborn child as leverage. This could lead to a race against time for Bruce to protect his family.
One possible plot could be that Thomas Wayne somehow time - travels to the present where Bruce Wayne is Batman. Thomas could initially be shocked at how Bruce has turned out, but then come to understand his motives. He might offer some old - fashioned wisdom that helps Bruce in his fight against crime.
A possible plot might involve Harry Potter (as Bruce Wayne) having to keep his magic a secret in Gotham while still trying to uphold justice. He might face challenges like dealing with anti - magic sentiment in the city while also using his magical knowledge to outwit his enemies. For example, he could use the invisibility cloak as a new tool in his crime - fighting arsenal, or use magic to enhance his physical abilities like Batman's training does. He may also have to deal with the magical underworld that exists in Gotham unbeknownst to most of the city's inhabitants.
Maybe in the fanfic, there's a threat to the Wayne family fortune. Terry and Bruce have to work together, with the rest of the family, to protect it. This could involve using their wits and skills in different ways, and also show how the family members support each other in tough times.
The plot is also important. It could involve them facing a new villain or a threat to Gotham that tests their relationship. Maybe a situation where Damian's actions put him at odds with Bruce's code of ethics, and they have to work through it. This kind of plot tension can make the fanfic really engaging.