There could be a mentor figure, perhaps an older and more experienced ice elemental who guides Harry in controlling his powers. Another character might be a friend from a non - elemental background who is trying to understand Harry's new identity.
It's possible that there's a love interest for Harry in the fanfic. This character could be someone who is initially attracted to Harry's unique powers but then falls in love with his true self. They could be from a different elemental group or not an elemental at all, which would add an interesting dynamic to their relationship.
Maybe there's a villain in the story. It could be someone who wants to use Harry's ice elemental powers for their own evil purposes. This villain could be another elemental who has a grudge against ice elementals or just a power - hungry individual. There might also be a group of fellow ice elementals that Harry teams up with to fight against the common threat.
One main theme is power and control. Since Harry is dealing with ice elemental magic, he has to learn how to control this new and powerful force. Another theme is identity. With the addition of these new powers, he has to re - evaluate who he is as a wizard.
Well, it might be that Hermione is one of the main characters in this 'harry potter elemental fanfic'. She could be researching about the origin and proper use of elemental magic. Ron could also be there, and maybe he discovers an unexpected elemental ability, like the ability to manipulate earth, which he uses to help in various situations, like creating barriers or finding hidden passages. There could also be a new student from a far - off land who has a pure elemental magic that no one at Hogwarts has seen before.
Well, Dumbledore would most likely be a significant character. He might be one of the few people who quickly understand the implications of Harry being a mutant. He could help Harry navigate through the challenges that come with his new identity. Additionally, there could be some mutant characters from the mutant universe who cross over into the Harry Potter world. For example, a character like Professor X could be an interesting addition, guiding Harry in understanding and using his mutant powers in a responsible way.
Maybe there's a human friend who is really curious about Harry's new situation. This friend could be constantly asking questions and trying to get involved in Harry's alien - related adventures, adding some comedic relief to the story.
Besides Harry, there could be a character who is a descendant of an ancient elemental magic family. This character might initially be a rival to Harry in mastering the magic but later becomes an ally. Also, Dumbledore could play an important role. He might be secretly guiding Harry in his journey of learning elemental magic, using his own deep knowledge of the wizarding world's secrets.
I don't know for sure as it depends on the specific fanfic. There could be a boss - like character who oversees Harry's work in the unit.
Maybe there's a character named Jack, who is a bit older than Harry and has been on the streets for a long time. He acts as a sort of mentor to Harry, showing him the ropes. And then there could be a young mother named Sarah who is also living on the streets with her baby. Harry might help her out sometimes, and she in turn offers him a sense of family.
Another character could be a fellow inmate who has been in jail for a long time. He befriends Harry and teaches him the ropes of surviving in jail.
It could be Hermione. Since she's Harry's close friend, she would likely play a significant role in a story where Harry is immortal. She might be the one trying to help Harry adjust to his new state or be involved in his adventures in some way.
Well, Gandalf would probably be a main character too. He is a powerful wizard in Middle - earth and his knowledge and guidance would be crucial in a story where Harry is involved. He could be the one to help Harry understand the differences between his magic and the magic of Middle - earth. Also, Aragorn could be part of it. His leadership and warrior skills could be something that Harry looks up to or tries to learn from in this fanfic.