One consequence could be that he becomes more curious and starts to explore places he shouldn't. Since he can be invisible, he might sneak into the restricted section of the library or into the teachers' lounge to uncover secrets. This could lead to him getting into trouble or finding out important information that changes the course of the story.
He might discover it by accident. Maybe he was in a dangerous situation in the fanfiction, like being chased by some dark creatures. In a moment of panic, he wished to disappear and suddenly found himself turning invisible. It could also be that he was exploring an old, magical place and stumbled upon an ancient spell or artifact that granted him this power.
One popular 'harry potter is invisible' fanfiction might be 'The Invisible Adventures of Harry Potter' where Harry discovers a spell that makes him invisible by accident and he has to navigate Hogwarts unseen. It's filled with humorous situations as he tries to avoid being detected by his friends and teachers.
Another possibility is that it's a result of his unique connection with a phoenix. Since phoenixes are associated with fire, through some kind of magical bond, Harry could gain the ability to turn into fire. This bond might develop gradually as he interacts more with the phoenix in the fanfiction.
Yes. In some fanfictions, authors like to give Harry Potter extraordinary abilities, and turning intangible could be one of them. It allows for more creative and exciting plot developments.
A possible plotline could be that Harry uses his invisibility to spy on Voldemort's followers and gather intelligence for the Order of the Phoenix. This would add an element of mystery and danger as he has to be extremely careful not to be detected.
There could be new characters created specifically for this fanfiction. For instance, a young wizard who has a natural ability to be invisible from birth. This character could bring a fresh perspective to the story, as they might not understand the normal rules of the wizarding world since they've always been invisible. They could be both a source of mystery and a key to solving some of the big problems in the fanfiction, like a hidden threat that only they can see due to their unique invisibility - related abilities.
In some fanfictions, Naruto might turn invisible through a special jutsu he discovers or is taught. It could be a new form of ninjutsu that manipulates light and reflection to make his body unseen, much like the way some real - world concepts of invisibility work by bending light around an object.
One interesting plot could be Harry using an invisibility spell in a new way. For example, he might use it to spy on the Death Eaters' secret meetings without being detected. He could then use the information he gathers to outwit Voldemort. Another plot could involve Harry being invisible during a Quidditch match and using it to his team's advantage by confusing the opposing team. Or perhaps there's a fanfiction where an invisible Harry has to solve a mystery within Hogwarts that no one else can see is happening because he's the only one who can be undetected.
One interesting concept could be the idea of hidden magical abilities that are not explored in the original series. For example, characters might have the power to become truly invisible without the use of a cloak, and this could lead to all sorts of secret adventures.