Well, one possible plot could be that Voldemort's daughter tries to redeem the name of her father. She might struggle with the dark legacy she has inherited while also being drawn to the world of Hogwarts and the light. Maybe she forms an unlikely friendship with Harry Potter, which causes a stir among both the Death Eaters and the Order of the Phoenix.
Voldemort's daughter herself would be in a very difficult position. She might be shunned by many in the wizarding world just because of who her father is. But some might be curious about her. For example, Luna Lovegood could be one of the first to approach her without judgment, which could start a chain reaction of other characters slowly warming up to her. And the Death Eaters might try to manipulate her into following in her father's footsteps.
One possible plotline could be the daughter of Voldemort struggling with her identity. She might be torn between her father's dark legacy and the potential for good that she sees in the wizarding world. Another could be her forming an unexpected alliance with Harry Potter, perhaps to atone for her father's sins or to find a new path for herself.
She can change the power dynamics. Since she has Voldemort's blood, she might have access to some of his knowledge or power. This could either be a threat to Harry Potter and his friends or a means to help them, like if she can unlock secrets about Voldemort's remaining followers.
In a fanfiction where Fem Harry is Voldemort's daughter, it could lead to a whole new set of adventures. She might struggle with her identity, not knowing whether to embrace her father's dark side or follow the path of good. Her magical abilities could be a mix of Voldemort's dark magic and something more. For instance, she might have an easier time with dark spells but also possess a hidden power for good. The Death Eaters could have a different attitude towards her. Some might try to recruit her, while others might fear her as a potential threat to Voldemort's rule. This would create a lot of internal conflict for Fem Harry, as she tries to figure out where she belongs in this strange new world.
Perhaps 'y' is a relative of Harry's that was thought to be dead. This relative could have a unique magical heritage that they pass on to Harry, making him even more powerful. For example, if 'y' was a distant cousin from a line of powerful seers, Harry might develop some precognitive abilities.
Yes, there are likely fanfics out there with such a wild and unorthodox concept. Fanfic writers often come up with very creative and out - of - the - box ideas, and this is definitely one of them. It goes completely against the established canon of the Harry Potter series, but that's the beauty of fanfiction. It allows for exploring different 'what - if' scenarios.
Y/N should have their own goals and dreams. If they're interested in becoming an Auror, that can shape their actions and decisions. Their reactions to Draco should be based on their personality. If they're a shy person, they might be more hesitant around him. And make sure their dialogue is natural. Don't make them say things that are out of character just to move the plot along. For instance, if Y/N is a studious type, they're more likely to talk about books or spells when interacting with Draco.
Harry could become more powerful in a way that scares his friends. Voldemort's training might focus on the Dark Arts, which are powerful but dangerous. This could change Harry's magic style. He may become more solitary as his new skills and knowledge set him apart from his Hogwarts friends who follow a more traditional path of magic.