One possible plotline could be exploring the hidden family connections between them. Maybe Harry discovers that he has some distant family relation to Tom Riddle through a convoluted family tree. This could lead to a conflict within Harry as he tries to come to terms with having a relation to the dark wizard. And Severus Snape's family could be intertwined in this discovery, perhaps his family having some role in the past that led to the current situation.
Another idea is that a long - lost family heirloom is discovered that has a connection to all three families. This heirloom holds some powerful magic that can either save or destroy the wizarding world. Harry, Tom Riddle, and Severus Snape's families all have a claim to it. They have to work together (or in the case of Riddle, try to take it for his own dark purposes) to figure out the mystery behind the heirloom and its true power.
Tom Riddle's family values are often associated with a thirst for power and a disregard for others. His family, being descendants of Salazar Slytherin, might have passed down a sense of superiority. In fanfiction, his family values could be shown as the root of his dark path. He may have been taught from a young age that pure - blood wizarding families are superior, leading him to view those without pure blood as inferior and worthy of subjugation.
One common portrayal in fanfiction is that of Snape being suspicious of Tom Riddle when he was still a student at Hogwarts. Snape, with his sharp intellect, might notice things about Riddle that others overlook, like his unusual interest in certain dark spells or his ability to manipulate those around him.
In fanfiction, Tom Riddle and Severus Snape are often depicted in complex relationships. Riddle, as the future Voldemort, represents pure evil. Snape, on the other hand, is a more morally ambiguous character. Fanfictions might explore how Snape would react to the younger Riddle at Hogwarts. Maybe Snape would be one of the few to see the darkness in Riddle early on.
Perhaps in the fanfiction, Harry adopts Tom Riddle when he's still a young boy at the orphanage. Harry then uses his own experiences of growing up without parents to bond with Tom. He teaches Tom about magic in a different way than Dumbledore did, focusing on the positive aspects of magic for good. This could lead to Tom not becoming the evil Voldemort we know.
One possible plotline could be that they meet in their school days at Hogwarts. Tom, being the ambitious and sly student he is, notices Eileen's quiet strength. Maybe he tries to use her for some of his dark plans initially, but as time goes on, he starts to develop unexpected feelings for her. Their relationship could be filled with secrecy and internal conflict as Eileen might be torn between her own moral compass and her growing attraction to Tom.
One great fanfiction could be where Tom Riddle discovers Severus Snape's hidden potential in potions early on. It might explore how Riddle, with his ambition, tries to mold Snape into a more powerful ally. This could lead to a complex relationship filled with power dynamics and mutual respect for each other's skills.
In some fanfics, Snape and Riddle are portrayed as having a mentor - mentee relationship in reverse. Riddle, being older and more powerful, could have influenced Snape in ways that are not obvious in the original books. For example, in 'The Influence of Riddle on Snape', we see how Snape's early interest in the Dark Arts might have been a result of Riddle's presence at Hogwarts, even if they never directly interacted much.
One great Severus Snape and Tom Riddle fanfiction is 'The Darker Path'. It delves into their time at Hogwarts, exploring how their different natures interacted. Snape's complex relationship with the Dark Arts, influenced by Riddle, is a central theme. The story is full of intrigue and mystery.
One common theme is the exploration of complex relationships. Given the nature of these characters, there's often a lot of tension and power dynamics at play. For example, the contrast between Snape's loyalty and Riddle's (Voldemort's) evil can create interesting scenarios.
One possible plotline could be that Harry breaks a major Hogwarts rule, like sneaking into the Forbidden Forest. Snape catches him and decides that a severe punishment is in order, which in this case is spanking. Another could be that Harry fails a very important Potions test repeatedly, and Snape, frustrated with his lack of progress, resorts to this extreme form of discipline. However, these are all just fan - created ideas and not part of the official story.