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.
Another theme is the rewriting of their destinies. Fanfictions often take the basic premise of the Harry Potter universe and twist it so that Harry and Tom's fates are intertwined in different ways than in the original books. This can lead to stories about changing the past to create a better future for both of them.
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.
One common theme is the exploration of power dynamics. Since both Harry and Tom are powerful in their own ways, seeing how a female Harry would interact with Tom in terms of power is often explored. For example, who would be more dominant in certain situations.
One common theme is redemption. The female Tom Riddle might be on a path of self - discovery and trying to break away from the dark legacy of the male Tom Riddle. Harry often plays a role in guiding or being a catalyst for this change.
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.
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 very common theme is redemption. Tom Riddle, being the dark wizard he is, the soulmate bond with fem Harry can be seen as a chance for him to be redeemed. Also, the theme of self - discovery is present. Fem Harry and Tom Riddle both learn more about themselves through their connection. It's a complex relationship that is explored through these themes. For example, in many fanfictions, Harry tries to understand why she is connected to someone like Tom, which leads to her exploring her own values and beliefs more deeply.
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.
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.