The fanfiction might also explore a situation where Candace gets busted by her brothers first. They could turn the tables on her by proving that she's been so obsessed with busting them that she's actually been the one causing some problems herself. This would create a lot of drama and character development for Candace.
The parents, Mom and Dad, would probably play a significant role as they are the ones who could potentially bust Candace. Also, there could be some minor characters from the original show like Perry the Platypus. He might be involved in some way, perhaps he accidentally reveals Candace's plans which lead to her getting busted.
A really cool plot might involve Candace teaming up with an unexpected character to bust Phineas and Ferb. For example, she could team up with Doofenshmirtz. They both have their own reasons for wanting to stop Phineas and Ferb's projects. But as they work together, they start to see things from a different perspective and might even end up becoming friends with Phineas and Ferb instead.
Candace is obviously a very popular character as the whole concept often revolves around her. She's the one with the mission of busting Phineas and Ferb. Phineas and Ferb themselves are also really popular. Their crazy inventions and carefree attitudes are what drive Candace's need to bust them in the first place.
Well, usually there's some sort of punishment or confrontation. Maybe the person gets caught by the authorities or the victim and faces legal consequences.
Well, usually the peeping tom faces some sort of punishment or consequence. Maybe they get caught by the authorities and get thrown in jail.
One possible plot could be that Erza discovers she's pregnant and has to deal with the shock while still being part of her guild and its adventures. She might worry about how it will affect her ability to fight and protect her friends.
One possible plot could be that Mulan gets hurt on her way back home after the war. She might encounter bandits and get injured while defending herself. This would delay her return home and add more challenges to her journey, like finding shelter and treatment in an unfriendly area.
The fanfiction could focus on Dumbledore's backstory. Fans might write about his early years at Hogwarts as a student, his friendships, and how he developed into the great wizard he became. It could also include his interactions with other magical creatures in more depth than the original series, such as having secret meetings with centaurs or merpeople to gain wisdom.
In the fanfiction, Nathanael might get a miraculous related to his artistic talent. It could be a miraculous that enhances his creativity to superhuman levels. He could then use this to create amazing works of art that have some sort of magical or practical effect on the world around him, like inspiring people to be more kind or even physically changing the environment in a positive way.
The plot might involve the father of the baby as well. If the identity of the father is a mystery, Naruko could be on a quest to figure it out. Or if it's someone she knows, they could have different reactions to the news. For example, if it's a love interest, they might be overjoyed or terrified depending on their situation. There could also be elements of how the pregnancy affects Naruko's goals and dreams, whether she has to put them on hold or find a way to pursue them while being pregnant.