He could have the power to bring objects or people from different times and spaces into his current reality. This would not only be a very cool ability but also a very useful one. He could bring back long - lost magical artifacts or powerful wizards from the past to help in the present - day battles or to solve the current problems in the wizarding world.
He might have enhanced magical perception. Since he can control spacetime, he could be more in tune with the magical energy that flows through different times and spaces. This would allow him to sense things others can't.
Perhaps he has the ability to communicate with past or future versions of himself or other characters. By being able to access different times, he could form a sort of mental link. This would give him an advantage in getting information and solving problems. For example, he could ask his future self for advice on how to defeat a powerful enemy.
Well, it could change the whole sequence of events. For example, he might be able to go back in time to prevent certain tragedies from happening in the wizarding world. This would rewrite a lot of the original story's plotlines as we know them.
One consequence could be that he is feared by others. Fiendfyre is a very dangerous and dark magic, so if Harry is seen controlling it, some people in the wizarding world might view him with suspicion and fear, thinking he is turning to the dark side. Another consequence might be that it drains his magical energy a great deal. Controlling such a powerful and volatile spell could take a toll on his magical reserves, leaving him weakened after using it.
One challenge could be the basilisk's own will. Even if Harry has the ability to control it, the basilisk is a powerful and ancient creature with its own instincts. It might resist Harry's control from time to time, especially when it comes to situations that go against its natural behavior, like being made to not attack innocent students.
Some fanfictions give characters the ability to communicate with animals on a much deeper level than normal in the Harry Potter world. Instead of just understanding general emotions or simple messages, they can have full - blown conversations. This could lead to uncovering secrets that the animals have witnessed, or using them as spies in a battle of wits against the dark forces.
He could have the ability to control time, like his father the master. This would be a very powerful and unique ability. He might be able to freeze time during a battle or rewind time to correct a mistake.
In some Harry Potter fanfiction, the idea of controlling electricity could be really interesting. For example, a character might use magic to manipulate electrical currents in a Muggle device. This could be used for various purposes like creating a new form of magical - Muggle hybrid technology within the wizarding world. Maybe a young wizard discovers they can control electricity as an extension of their magic, and it becomes a crucial part of their adventures, helping them solve mysteries or defeat dark forces.
The combination of two very different power systems. All Might's super strength from 'My Hero Academia' and the magic in 'Harry Potter' create a contrast. It's like seeing how a physical - based hero would interact with a world full of spells and potions.
The original series has very strict rules about life and death. In the original, the dead are not to be controlled. But in this fanfiction, Harry having such a power is a huge deviation. It allows for a much darker and more complex exploration of magic. In the original, Harry's power comes from his own skills, courage, and the help of his living friends and mentors. Here, he's tapping into a power that is considered taboo.
One example could be a story where Harry discovers he has the ability to control insects during a Hogwarts summer. He uses this power to spy on the Malfoys and gather information that helps the Order of the Phoenix. The insects act as his little spies, flying into windows and reporting back to him through a magical connection.
The supreme Mugwump himself could be a main character. He might have his own backstory, motives, and goals that drive the story forward.