Maybe there was a rift between the monster world and the human world that was recently fixed. Boo, who has memories of Sully, immediately sets out to find him. When they reunite, Sully is initially shocked but then quickly warms up. They then work together to strengthen the bond between the two worlds, with Boo using her knowledge of both to help.
In a different plot, Sully has been searching for Boo in the human world secretly all these years. One day, he finally discovers where she is. He manages to make his way to her. Boo is a bit hesitant at first as she's older now, but the old connection between them resurfaces and they start to catch up, sharing stories of their lives apart and then becoming friends again like they used to be.
Sully might have developed more leadership qualities in Boo's absence. He could be more respected in the monster world. When Boo returns, he has to adjust to having her around again. Boo, on the other hand, could be more worldly. She might bring new ideas and a different perspective to the monster world that Sully and the others have to adapt to. Their reunion would be a process of readjusting to each other's new selves.
One popular Boo and Sully fanfiction might be those that explore their friendship in different scenarios. For example, there could be stories where they go on adventures outside of Monstropolis. Another type could be ones that focus on how Boo's presence changes Sully's perspective on humans in a more in - depth way.
One possible plot is that the man was a zookeeper. He took care of the lion when it was young. Then the lion was transferred to another zoo. Years later, the man visited the new zoo and the lion recognized him immediately. It was a happy reunion full of memories.
First, think about the relationship between Boo and Sully. What do you want to explore? It could be their emotional connection or some new adventures. Then, create a basic plot. Maybe start with an interesting event like Boo getting lost in a new part of Monstropolis and Sully having to find her.
Another theme might be perseverance. No matter who Sully is in this story, he may have had to persevere through challenges. For example, if he was an ordinary person, he might have faced difficulties in his career or personal life and kept going. If it was the famous Sully, he had to persevere through the intense situation of the flight emergency.
One possible plot could be that the murderer is a jealous rival. Maybe this rival has always been envious of Percy's popularity or special abilities, and finally decides to get rid of him. Another plot could involve a mystery where Percy is murdered and his friends have to piece together the clues to find out who did it. It could be that the real killer is someone they least expected, like a seemingly friendly acquaintance who has a hidden agenda.
One possible plot could be that Alderheart succumbs to an illness that has been plaguing the Clan. His friends and family are left to mourn his loss and deal with the void he leaves behind in the Clan's medicine den.
One possible plot could be that Harry is experimented on by dark wizards who are trying to create a new form of dark magic. They might use his unique magical abilities as a base for their experiments. Another could be that well - meaning but misguided witches and wizards experiment on Harry to find a cure for a deadly magical disease, thinking his famous resilience could hold the key. Or perhaps some alien - like magical creatures capture Harry and experiment on him to understand the human - wizard form better.
One possible plot could be that Beckett is kidnapped by a rival group who wants to use his skills or knowledge for their own gain. His friends then embark on a dangerous rescue mission.
One possible plot could be that Amelia and Kai are from different social classes in a historical setting. They fall in love but have to overcome the barriers of their different statuses.