In Harry Potter fanfiction, the Dark Mark often changes relationships in many ways. For starters, family relationships can be torn apart. If a family member discovers another has the Dark Mark, they might feel a sense of betrayal. Also, romantic relationships can be affected. A character's partner may not be able to accept the Dark Mark, seeing it as a sign of evil. On the other hand, some relationships might be formed out of the shared experience of having the Dark Mark, like a bond between two characters who are trying to resist Voldemort's control despite being marked.
If a character has the Dark Mark, their relationships with non - Death Eaters can become extremely strained. Friends may turn against them out of fear or a sense of moral obligation. For example, if a Gryffindor was marked, their former housemates might not trust them anymore.
In fanfiction, the invisibility cloak can create secrecy between characters. For example, if one character uses it to spy on another, it can lead to misunderstandings or new revelations about their relationship. It can also be a tool for characters to get closer without others knowing, like a secret meeting between two lovers.
If Harry got the Dark Mark in fanfiction, his story would take a dark turn. He'd have to face the prejudice of the wizarding community. His relationships with his friends like Ron and Hermione would be strained. They'd be constantly worried that Harry might be turning evil. And Harry would have to find a way to hide the mark's influence while trying to figure out how to get rid of it. His journey would be filled with more self - doubt and secrecy.
It often weakens his relationships with Ron and Hermione. Instead of relying on them, he may distance himself. For example, he might not share his problems with them as he used to.
It changes his character development in that he becomes more distrustful. Since he has the Dark Mark, he might start to doubt the intentions of those around him. He might think that people will always suspect him, so he becomes more withdrawn. Also, his sense of self - identity is shaken. He's no longer just the Boy Who Lived, but now he's someone with a mark associated with the darkest of magic. This could lead to him exploring his own morality more deeply. He might question if he's doomed to be like Voldemort just because of this mark, and he has to fight against that internal struggle to define who he really is.
In some fanfictions, Harry might use powerful ancient magic that he discovers in a hidden library or from an old wizard. This magic could be specifically designed to counter the dark magic of the Dark Mark.
Harry's character could be consumed by anger and a thirst for revenge in a dark fanfiction. This would make him more aggressive and less empathetic. Luna, however, might use the situation to grow in strength. She could become a sort of moral compass for Harry, but at the same time, she might have to harden herself. Maybe she starts to study dark magic not to use it but to understand it better and find ways to counter it. This would change her from a carefree observer of the magical world to a more proactive defender.
For Harry, if he goes dark, he might lose his sense of compassion. He could become more calculating and power - hungry. Tonks, on the other hand, might become more cynical. Her usually cheerful self could be replaced with a more guarded and suspicious personality as she deals with dark Harry.
The plot would change drastically. Firstly, Harry would lose the trust of many. Dumbledore might be more suspicious of him. Secondly, the Death Eaters could have different plans for him. They might try to use him as a weapon against the Order. Thirdly, Harry would have to constantly hide the mark, adding a new layer of secrecy to the story.
On the other hand, it could also attract the attention of some characters who are interested in the unusual or powerful. There might be a group of outcast wizards who see Harry's red eyes as a sign of his potential to be different from the normal wizarding crowd. This could lead to new friendships or alliances that Harry never expected.
Advanced technology can strengthen relationships. For example, if there are advanced communication devices, friends can stay in touch more easily. Harry could keep in closer contact with his friends at Hogwarts when he's away.