Harry Potter is bound to be one of the main characters. Since it's about 'double trouble', there could be a version of Harry that is different in some way, like an evil Harry or a Harry from an alternate dimension. Ron and Hermione would be there to support the real Harry. Dumbledore might also play a significant role as he often has the wisdom to deal with complex situations. And, of course, Voldemort could be a central figure as well, as he is the main antagonist in the Harry Potter series and any double trouble might be related to the battle against him.
One possible plot idea could be two versions of Harry Potter existing simultaneously in Hogwarts, causing chaos as they both try to deal with Voldemort in different ways. Another could be that a spell creates double trouble for Harry, like his magic splitting into two opposing forces that he has to reconcile.
In a fanfic, Harry might be having trouble sleeping because he senses a new dark force approaching Hogwarts. He lies awake at night, listening for any strange noises. Ron tries to cheer him up by telling him funny stories from their previous adventures, but it doesn't really help. Eventually, they decide to explore the Forbidden Forest at night to find out what's causing his unease.
One main theme could be the complex relationships within families. In the Harry Potter universe, family is often a mix of blood relations and found families. In this fanfiction, it might explore how characters deal with family members who have different values or loyalties. For example, Harry's relationship with the Dursleys is always a point of conflict, and the fanfiction could expand on that by showing how he overcomes or continues to struggle with their mistreatment.
One idea could be to have two rival trainers who both accidentally release two extremely rare and powerful Pokemon at the same time, causing double the chaos. These Pokemon could be a legendary pair that are known to cause trouble when together, like Ho - Oh and Lugia. Their combined powers could disrupt the balance of the Pokemon world, and the trainers must work together despite their rivalry to calm them down.
The main characters could be a pair of best friends. One friend could be a very cautious and methodical trainer, while the other is more impulsive. They both encounter a double - trouble situation when they come across two wild Pokemon that have been affected by a strange energy. These Pokemon start attacking everything in sight, and the two friends have to combine their different training styles to subdue them. For example, the cautious friend might try to analyze the Pokemon's behavior first, while the impulsive one jumps right into battle.
The 'trouble with imps' in a Harry Potter fanfic might also be about how difficult it is to control or get rid of them. Imps are not as powerful as some other magical creatures but they are very tenacious. If they've infested a certain area of Hogwarts, like the Forbidden Forest or an old, unused classroom, it would be a headache for the teachers or the caretaker, Filch. They might try different spells to banish the imps, but the imps keep coming back, causing continuous trouble.
Well, a 'pokemon double trouble fanfic' could be about all sorts of things. It might be a story where two Pokemon get into some kind of mischief or face a double - sized trouble together. Maybe it's about two trainers who have Pokemon that cause double the chaos during a battle or an adventure.
One common theme is loyalty. Since the characters are double agents, they constantly struggle with where their true loyalties lie, whether it's to the good side like the Order of the Phoenix or the dark side like the Death Eaters. Another theme is secrecy. They have to keep their double identity a secret which adds a lot of tension to the story.