A really interesting plot could be Harry's education at Hogwarts. Given his parentage, he might have unique magical abilities that are a combination of Tom's and Severus's powers. His teachers would be both intrigued and cautious. His friendships could also be affected, as some students might be afraid to be associated with him, while others might be drawn to his power and mystery.
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.
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.
One idea could be that Severus, with his potions expertise, is recruited by the Bond - like organization in a world where magic and espionage co - exist. Harry, being a key figure in the wizarding world, gets involved too. Maybe they have to work together to stop a dark wizard who is collaborating with a group of evil non - magical villains.
In this type of fanfic, a really interesting plot might be that Harry and Tom Riddle are in an alternate reality. In this reality, Hogwarts has a different set of rules and magic. They are both outsiders in this new world. They start to rely on each other for survival, and in the process, they discover new aspects of their magic and themselves. Harry tries to use this opportunity to redeem Tom Riddle, while Tom is constantly tempted by his old, dark ways.
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.
Another idea is that after Snape sacrifices himself, his spirit somehow remains bound to Harry. He becomes a sort of spiritual guide for Harry, like a father figure from beyond the grave. Harry has to learn to communicate with Snape's spirit and in the process, they heal old wounds and form a deep bond.
Perhaps a plot where Harry son of Eris is on a quest to find out more about his mother Eris. Along the way, he teams up with some unlikely allies. They might have to go through dangerous places like ancient tombs or forgotten magical forests. His powers could be both a help and a hindrance in these situations. For instance, his ability to create chaos might open up paths that were previously blocked, but also attract unwanted attention from dark creatures.
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.
In a more complex plot, it could be set in an alternate universe where Severus and Harry are on the same side from the start. As part of a team - building exercise of sorts, Severus uses tickling as a way to break the ice with Harry and the other young wizards. This leads to a series of adventures where their new - found camaraderie is tested and strengthened through various challenges, with the tickling incident being a recurring theme that is both humorous and a bonding factor.
One idea could be a story where Harry, Draco, and Severus are forced to work together on a dangerous mission to save Hogwarts from a new dark threat. They start off distrusting each other but gradually learn to respect and rely on one another.
One idea could be that they start off as enemies but are forced into a marriage by some magical law. As they live together, they gradually discover each other's hidden depths and develop a grudging respect that turns into love.