Harry, Hermione and Ron are staples. But don't forget about Fred and George Weasley. They could be at the summer camp causing all sorts of mischief and coming up with new pranks. Seamus Finnigan might also be there, with his penchant for accidentally setting things on fire with his magic. And then there are the teachers. Hagrid could be at the summer camp, introducing the students to all sorts of magical creatures. Snape might be there too, though still as grumpy as ever, teaching potions or some other dark arts - related subject.
Harry Potter himself is often a common character. He could be at the camp as a mentor or a special guest. Hermione Granger might also be there, sharing her vast knowledge of magic with the campers. Ron Weasley could be around too, getting into some comical situations. Additionally, new characters created specifically for the fanfiction might be present, like a young wizard who is a bit of a troublemaker at the camp.
In many Harry Potter summer vacation fanfictions, Sirius Black is also a character that shows up. Given his relationship with Harry and his status as a wrongly - accused wizard. He could be involved in protecting Harry during the summer or helping him with some secrets about his family. Luna Lovegood might also be included, with her unique perspective on magic and the wizarding world, she could add an interesting element to the summer vacation stories.
One interesting storyline could be a mystery that unfolds during the summer camp. For example, a series of strange disappearances of magical creatures in the camp area. The characters, like Harry, Hermione and Ron, would have to use their skills to solve it. Maybe they discover that a dark wizard from the past has left a curse that is causing the disappearances as part of a plan to gain power in the wizarding world again.
Harry Potter himself is surely important. He is the main character and the one going through the 'summer of change'.
Obviously, the core Avengers like Iron Man, Captain America, Thor, and Hulk could be the main characters. They are the most well - known and would bring their unique personalities to the camp setting.
Most probably, the main characters would include enthusiastic trainers of different ages. There might be a budding trainer who is shy but has a very powerful Pokemon. Another could be an experienced trainer who acts as a mentor to the younger ones at the camp. And of course, there could be a mischievous trainer who always gets into trouble but has a heart of gold.
Dumbledore sometimes makes an appearance in Harry Potter summer fanfiction too. His mysterious ways might be explored further during the summer months. Maybe he has some secret plans for Harry that he reveals during a quiet summer night at Hogwarts. Also, Luna Lovegood can be a popular character in these fanfictions. Her unique perspective on the magical world can add an interesting twist to summer - related stories, like her seeing strange magical creatures that only come out during summer.
Often, there are characters inspired by the original Harry Potter series. You might see a young wizard or witch who is like a new - age Harry, brave and curious. There could also be a Hermione - like character, really smart and always ready to share knowledge about magic. And of course, a Ron - like character, a bit clumsy but loyal.
One more common theme is growth. The characters in the fanfictions often go through personal growth. They might start out scared of something on the island but by the end, they overcome their fears. Also, the theme of community is present. How the different characters come together to form a community on the island and how they deal with problems as a community is often explored in fanfictions.
Harry Potter himself is often a central character. He might be exploring the vaults in search of something that could help him defeat Voldemort once and for all, like a powerful weapon or a spellbook.