The fanfic might reimagine Harry as a character who is constantly at odds with himself. He has the potential for great power from Tom, but also the emotional depth and loyalty from Severus. This internal struggle could be a major part of his character arc, as he tries to figure out who he really is and how to use his abilities for good, despite the dark shadows of his parentage.
The fanfic might reimagine Harry as being more in tune with the concept of death. So, instead of just facing death as in the original books, he might have a deeper understanding and almost a kinship with it. This could change his decision - making process. For example, he might be more willing to take risks that involve death because of his connection to Thanatos. Also, his relationships with his friends could be different. They might not fully understand this new aspect of him, which could create some tension.
Harry is sometimes depicted as the one who breaks through Snape's walls. He uses his Gryffindor courage not just in battles but also in matters of the heart. He bravely approaches Snape and tries to build a relationship. Snape is then reimagined as a character who is in need of this love and acceptance. His cold and often cruel demeanor in the original story is softened, and he becomes a character who is capable of great love and tenderness when it comes to Harry.
Well, it completely changes the family dynamic. Instead of being related to the Potters and the Dursleys, he has a connection to two very different and powerful wizards. This would likely mean a different upbringing and set of values.
Perhaps there's a plot where the wizarding community reacts to Harry's parentage. Some might fear him because of Tom's dark past, while others see potential in the intelligence and skills he could have inherited from Severus. This could lead to a lot of political and social intrigue within the story.
Severus' character undergoes a major transformation. He begins to value relationships more, especially his newfound father - son relationship with Harry. He may start to interact more with the other students in a less intimidating way because he realizes that being harsh all the time isn't good for anyone, especially Harry. He also becomes more involved in the non - potions aspects of Harry's life at Hogwarts, like helping him with his other studies or dealing with bullying from other students. This shows a side of Severus that was previously hidden, a side that cares deeply for someone other than himself.
Tom might be a distant and somewhat menacing figure. He could have his own motives for having a son with Severus, perhaps related to some grand plan for power. Harry might be in awe of Tom's power but also afraid of his dark side.
One possible plot idea could be Harry growing up with a conflicted identity. Since Tom is often associated with dark magic and Severus has his own complex past, Harry might struggle to come to terms with his heritage. He could be shunned by some in the wizarding world who fear his connection to Tom.
There's 'A New Destiny'. This fanfic explores how Harry, as the son of Tom and Severus, has to navigate the complex wizarding society. It shows his struggles with the expectations and prejudices that come with his heritage, and how he tries to find his own place in the wizarding world.
Harry might be extremely hurt. He could initially feel a sense of shock and disbelief. After all, he may have started to develop some feelings of trust or kinship towards Severus. Then, he might turn to anger. Anger at being rejected, especially if he doesn't understand the reasons behind it. He could also feel a sense of loss, as if he has been deprived of a chance at a real family connection.
He becomes more conflicted. Knowing he's Voldemort's son, he's constantly in turmoil about his true nature. His confidence might waver as he wonders if he's capable of the same evil as his father.