Friendship and mentorship are also common themes. Some fanfictions depict Harry trying to be a friend or mentor to Tom Riddle in an attempt to change his future. Additionally, the mystery aspect is there. Since Tom Riddle has so many secrets in the books, fanfiction authors like to expand on those mysteries. For example, exploring his family history further and how that could impact his relationship with Harry in a non - lemon way.
One common theme could be the exploration of the dark and light within both characters. Since Tom Riddle represents the dark side and Harry the light, their relationship in fanfiction might delve into how they influence each other in that regard.
One common theme could be the exploration of the power dynamics between them. Given Tom Riddle's inclination towards power and Harry's role as his foil in the original story, this can be played out in interesting ways in lemon fanfiction.
Another theme is redemption. Some fanfictions show Tom Riddle being redeemed through his relationship with Harry Potter. It's an interesting take on the characters as it gives Riddle a chance to change his fate.
A theme that is often explored is the exploration of the characters' pasts. Since Tom Riddle jr has a very troubled past, fanfictions might dig into it more deeply. And for Harry, his connection to Tom through the Horcruxes also plays a role. By exploring their pasts, the fanfictions try to show how they could have a different relationship than what was shown in the original books.
One common theme is redemption. Since Tom Riddle becomes Voldemort, the idea of Harry being his soulmate often leads to themes of whether Tom can be redeemed through their connection.
One common theme is redemption. Many fanfictions explore the idea of Harry trying to save young Tom Riddle from his dark future. Another theme is power. Since both Harry and Tom are powerful wizards, there are often power struggles or comparisons between them.
One common theme is the exploration of good and evil. Since Tom Riddle becomes Voldemort, fanfictions often examine how Harry, as the symbol of good, could influence or be influenced by Tom. Another theme is the power of magic. Writers like to play with different magical concepts and how they might be used by Harry and Tom.
The exploration of good and evil is a big theme. Given Tom's inclination towards the dark side and Harry's role as the 'Chosen One' for good. Also, there's the theme of destiny. Fanfics often play with the idea of whether their destinies are set in stone or can be changed by their relationship. In many of these fanfics, there's also the theme of secrecy, as their relationship is often something that has to be hidden from others in the wizarding world.
The exploration of their complex relationship is also a major theme. They are often portrayed as enemies at first, but as the story progresses, a strange kind of attraction or respect might develop between them. This can involve themes of opposites attracting, like Harry's light - heartedness against Tom's brooding darkness.
One common theme is the battle between good and evil within the context of their relationship. Since Tom Riddle is the embodiment of evil as Voldemort, and Harry is the hero, it's often explored how Harry might influence Tom or vice versa.