Well, often in such fanfictions, the relationship can be one of mentorship in a way. Tom Riddle, being more experienced and powerful, could be seen as a guiding figure for Draco Malfoy. Draco, who is often portrayed as a bit lost and trying to find his place in the dark side of the wizarding world, might look up to Tom. Their relationship might also be about Draco trying to prove himself worthy in Tom's eyes, much like how Draco tries to please Voldemort in the original series.
A third common theme could be family heritage. Since both come from families with a certain reputation in the wizarding world, fanfictions might delve into how their family legacies interact. For example, how the Malfoy family's long - standing pure - blood status relates to Tom Riddle's own claims to pure - blood heritage and how this affects their relationship within the fanfiction narrative.
A popular one is 'Three Paths Converged'. This fanfiction delves deep into the emotional aspects of the relationships. Cedric is often the mediator between Harry and Draco's more volatile relationship. The author does an excellent job of showing how their interactions change over time, from initial distrust to a deep and meaningful connection.
One common theme is power dynamics. Given that Tom is often associated with a thirst for power, and Lucius also has his own sense of power within the wizarding world, and Severus has his own influence in different ways, and of course Harry is the Boy Who Lived with his own power. How they balance, compete, or share power among themselves is often explored.
There's also 'The Dark Alliance'. This one has a more angsty take on their relationship. Tom Riddle, with his dark ambitions, and Draco, who is often conflicted in his own way, come together in a story filled with power struggles, loyalty issues, and a slowly budding, albeit complicated, relationship.
One key theme is power. Tom Riddle is power - hungry, and Draco comes from a family with a certain amount of influence. Their relationship can be seen as a struggle or an alliance in terms of power. Another theme is redemption. Sometimes Draco is written as a character who can redeem Tom Riddle from his dark path.
One common theme is redemption. Lucius, being a former Death Eater, often goes through a process of redeeming himself in these fanfictions. Harry, with his forgiving nature, plays a part in this. And Draco, caught between his family's dark past and a new path, also experiences growth towards redemption.
A major theme is the exploration of complex relationships. Given their very different backgrounds and personalities, seeing how they interact and form relationships is fascinating. Also, the theme of self - discovery is common. Each character discovers new things about themselves through their interactions with the other two. For example, Draco might discover that he doesn't have to be defined by his family's past actions, Snape might find new purpose, and Harry might understand more about the gray areas of the wizarding world.
One great 'Harry x Snape x Draco fanfiction' is 'The Unlikely Bond'. It explores their complex relationships in a unique way. The author delves into how their different personalities interact and how they might overcome their initial enmities in the wizarding world. Another one could be 'A New Perspective' which focuses on a magical adventure that forces them to work together and in the process, they discover new sides of each other.
One common theme is redemption. Given Snape's complex past and Draco's actions during the wizarding war, there's often a theme of them finding redemption through their relationships with Harry. Another theme is the exploration of forbidden or unexpected relationships. The three characters have had a lot of animosity in the original story, so fanfictions often play with the idea of how they can overcome that and form a unique bond.