A possible plot for Harry and Tom mate fanfiction is that they are both sent on a special mission by Dumbledore. Along the way, they have to rely on each other's strengths. Tom might use his intelligence and cunning, while Harry uses his courage and loyalty. They could also encounter magical creatures that they have to work together to defeat. This would force them to put aside their differences and form a bond. And as they complete the mission, they realize that they can learn a lot from each other.
Well, in a Harry and Tom mate fanfiction, they could be magically bonded against their wills. At first, they are furious about it. But then, as they start to experience each other's emotions and memories, they begin to understand each other better. For example, Harry gets to see the reasons behind Tom's early insecurities that led him to become Voldemort. Tom, on the other hand, sees Harry's struggle with his fame and the weight of his destiny. This mutual understanding could lead to them becoming true mates and using their combined powers to bring about positive change in the wizarding world.
One idea could be that Harry discovers a magical realm where Jareth rules and they initially clash due to their different personalities. But as they face common threats, like a dark force trying to invade both their worlds, they start to understand each other and form a bond. Another could be a story where Harry is transported to Jareth's world and has to learn the rules there to survive, and Jareth takes an interest in him because of his unique magic from the wizarding world.
One idea could be that Harry and Tom meet in an alternate universe where they are not enemies. They discover they have a shared love for magic theory and start to study together, gradually developing feelings for each other. Another plot could be that they are forced to work together on a dangerous mission. Through facing hardships side by side, they realize their connection.
One idea could be that they discover their brotherhood through a magical accident. Maybe a spell goes wrong and reveals their hidden family connection. Then they have to deal with the shock and also how it will change their relationships with others at school.
A really interesting plot could be that a goblin mate has a unique magical ability that is the key to saving Hogwarts from a new dark threat. The wizarding characters initially doubt the goblin but gradually come to realize their importance and the power of their bond.
One plot idea could be that Fenrir's mate is a powerful witch who has the ability to control his werewolf side. She could use her magic to soothe him during his transformations and together they try to find a way to end the discrimination against werewolves in the wizarding world. This would involve them facing many challenges, such as the Ministry of Magic's strict laws and the prejudice of other wizards.
One idea could be a werewolf character finding their true mate among the Harry Potter characters. Maybe a werewolf who has always felt like an outcast in the wizarding world finally meets someone who accepts them completely. This could lead to a story of self - discovery and acceptance for both the werewolf and their mate.
Perhaps the locket contains a part of Tom's soul that is still somewhat 'good'. Harry accidentally releases this part while investigating the locket. This 'good' part of Tom then tries to help Harry defeat the remaining evil parts of Voldemort, leading to a very strange alliance between Harry and this new aspect of Tom.
A more complex plot might be where both Harry and Tom are sent back in time to a point where the Hogwarts founders are still alive. They get involved in the founding events of Hogwarts, and Harry has to stop Tom from influencing the founders in a way that would make Hogwarts more exclusive and dark - sided. Harry could try to work with the founders to see the potential danger in Tom even at a young age.
One idea could be that they work together to solve a mystery in the wizarding world that neither could solve alone. Maybe it's about a series of strange disappearances in Hogwarts that are linked to an ancient curse.
One idea could be a time - travel fanfic where Harry goes back in time and tries to prevent Tom Riddle from becoming Voldemort. He could try to befriend the young Tom and show him a different path. Another could be a fanfic where Harry and Tom are somehow trapped in an alternate dimension together and have to work together to escape, all while Harry tries to understand what made Tom turn so evil. A third idea is a fanfic where Tom Riddle actually has a change of heart early on due to some magical accident that makes him experience a different kind of love and kindness, and Harry has to deal with this new Tom in Hogwarts.