Obviously, Harry Potter is one of the main characters. He's the central figure around which the story revolves. And then there would be the giants. Maybe a particular giant who takes Harry in or becomes his mentor or adversary.
One interesting plot could be Harry learning unique magic from the giants. Since they have their own form of magic that's different from what he's used to at Hogwarts. Another might be how he adapts to their large - scale living environment, like finding a way to communicate effectively with them despite the size difference.
Harry Potter himself could be one of the main characters. Given his propensity for getting involved in dangerous and mysterious situations, he might be investigating the secrets of giants' blood.
Harry Potter is the main character for sure. In addition, Dumbledore or other Hogwarts professors could make appearances. They might come to check on Harry or give him advice regarding his new life in Potter Manor. There could also be some family members from the Potter family tree, who were thought to be long - gone but now reappear in the form of memories or spirits in the manor.
Obviously, Harry Potter is the main character since it's about him living on his own.
Hermione could be one. She might follow Harry to the island to help him out. Another could be Ron, his loyal friend. Or it could be some new characters created specifically for this fanfiction, like a wise old wizard who has been living on the island for centuries.
There could be an old French wizard named Alphonse. He might be a mentor to Harry, passing on his knowledge of ancient French magic. Also, a young French witch named Celeste could be a main character. She and Harry could develop a friendship or more, and she could be part of Harry's new life in France, like helping him understand the French magical education system which is different from Hogwarts.
Hermione could be one. She might follow Harry to Australia to continue their adventures together. She could be interested in studying the different magical plants in Australia and how they can be used in potions.
I don't know for sure as I haven't read this particular fanfic. But it could have the main character be an original creation with the 'lionheart' trait, or it might center around a well - known Harry Potter character like Harry himself with some new 'lionheart' - inspired story arc.
Well, in many Harry Potter fanfics, even those named 'the change', the main characters often include Harry, Hermione, and Ron. However, depending on what the 'change' is about, new characters could be introduced or existing minor characters could be promoted to main character status. For example, if the change is about the Slytherin house becoming more inclusive, we might see Draco Malfoy taking on a more central role in the story, along with the usual trio.
It could be a Muggle - born protega. This character would face unique challenges as they try to protect the wizarding world while also dealing with their own identity issues. They might have friends among the Hogwarts students, and together they form a group to counter a new evil force that targets both Muggles and wizards.