Who could be the main characters in a 'Harry is in the Royal Navy' fanfic apart from Harry?

Obviously, Harry is one of the main characters. There might also be his commanding officer, who could be a strict but fair person guiding Harry through his naval career. Another main character could be Harry's best friend on the ship, someone he shares his thoughts and experiences with.

Hermione could follow Harry to Japan to continue their magical adventures together. She would be eager to learn about Japanese magic and study in their libraries. Another character could be a Japanese wizard who becomes Harry's guide, showing him around the magical places in Japan and teaching him about local magic.

In a 'Harry is in the Royal Navy' fanfic, the plot could revolve around Harry's relationships within the navy. He might have a mentor who teaches him the ropes and helps him grow as an officer. There could also be a rivalry with another sailor, which adds drama and conflict to the story. Harry could be involved in various naval exercises and operations, showing his development over time.

Obviously, Harry's parents, James and Lily, would be main characters as their portraits are central to the story. Dumbledore could also be an important character. He might be the one who either hid the portraits or knew where they were all along and guides Harry to them.

There could be the Dragonborn. If Harry is in Skyrim, he might cross paths with the Dragonborn, and they could either become friends or rivals depending on the situation.

A member of the royal family could be a main character as well. For example, a young prince or princess who discovers their magical abilities or is drawn into the wizarding world. They would have to learn to balance their royal duties with their newfound magical identity. And then there could be a wizard or witch who acts as a guide for this royal person, like a Hogwarts professor or an Auror.

There might be some original characters created for the fanfic. For example, a wizard who has prior experience as a Navy Seal in the Muggle world and now brings those skills back to the wizarding world. He could be a mentor - like figure, teaching other wizards about things like discipline and combat strategies. Or maybe Ron could also take on a more prominent role, with his loyalty and courage being emphasized in a Navy Seal - inspired context.

Hermione would definitely be one of the main characters. She would be very curious about Death's presence at school. She might try to research about it in the library, and her inquisitive nature would lead to some interesting interactions with Death. For example, she could ask Death about the secrets of the afterlife or some ancient spells related to death magic.

There might also be some new or minor characters from the wizarding world that are introduced specifically for this fanfiction. For instance, an old healer who has a unique method of restoring eyesight that no one else knows about. This character could play a crucial role in Harry being able to see again.

One main character could be Griphook. He already has a complex relationship with Harry Potter in the original series. In a goblin rebellion fanfiction, he could be a key figure leading the goblin revolt, using his knowledge of the wizarding world and his own skills to strategize against the wizards. Another character could be a young goblin apprentice who is caught between his loyalty to his own kind and his admiration for Harry Potter and the wizarding world.