In some cases, when Dexter gets caught, the people who catch him might try to rehabilitate him. They could think that there's still some good in him and attempt to change his ways. However, Dexter might resist this change as his nature is deeply ingrained. This could lead to a power struggle between him and those who want to reform him, creating a lot of drama and tension in the fanfiction story.
In some fanfictions, Dumbledore is portrayed as having a lot of secrets. If he gets caught, it could be related to his past. Maybe some old enemies find out where he is and catch him. Then he would have to deal with his past coming back to haunt him. His friends might try to rescue him, but it would be a very difficult situation for him, and it could change the whole dynamic of the fanfiction story.
One possibility is that Dumbledore gets caught spying on a group of Death Eaters. This would put him in a very dangerous situation as the Death Eaters are extremely cruel and loyal to Voldemort. He might be tortured for information about the Order of the Phoenix. However, Dumbledore is very resourceful and would probably be able to hold his own against them for a while, giving his allies time to figure out a rescue plan.
Some characters might be shocked. They could never have expected Dexter to be involved in such situations.
Well, it could be that Ash gets caught in the Pokeball by accident. Once inside, he might start to understand the feelings of Pokemon when they are captured more deeply. He could try to figure out a way to escape, and in the process, learn some secrets about how Pokeballs work that he never knew before.
Maybe he'll go on a rampage in the fanfiction world. He could start using his powerful jutsu to show his anger, like unleashing a Rasengan on the source of his annoyance.
He could use his ninja skills to fight back. Naruto has a wide range of jutsu at his disposal, like the Rasengan. So, he might quickly launch a counter - attack to protect himself.
He might find himself in strange situations that the fanfiction writer has created. For example, he could be stuck in an alternate dimension where the rules of his powers are different. Maybe he's trapped in a world where all his friends have turned against him because of a plot twist in the fanfic.
It could also create a tense situation within the group he belongs to. The others would be worried about him and might split their focus between their ongoing tasks and taking care of Leo. This could lead to some internal conflicts as they try to balance everything. They might argue about the best way to help him or who should stay with him while others continue their mission.
In fanfiction, when Naruto gets called by the council, he might be faced with various challenges. Maybe they will question his loyalty to the village again, despite all he has done. It could also be that they want to assign him a difficult mission that only he can do because of his unique abilities.
She might lose her friends. In fanfiction, when a character like Angelica gets in trouble, it often leads to a strain in relationships. Her friends could start to avoid her, thinking she's a bad influence or too much trouble to be around.