One theme could be the cycle of abuse. Harry might struggle with breaking free because he has some feelings for Tom, similar to how real - life abuse victims often have complex emotions towards their abusers. Another theme could be self - discovery. Through the abuse, Harry could learn more about his own limits and what he truly wants in a relationship.
Power dynamics is a big theme. Tom may have more power in the relationship, whether it's through magic or his manipulative nature, and he uses it to abuse Harry. Redemption could also be a theme. Maybe Tom realizes the error of his ways and tries to make amends, or Harry has to find a way to forgive Tom for what he's done. And of course, the theme of survival, as Harry has to find a way to endure and escape the abuse.
One possible fanfiction idea could be that in this relationship, Tom initially hides his dark tendencies. Harry, being abused in his past life, is vulnerable. Tom might use mind games on Harry, which Harry slowly realizes. But his love for Tom makes him conflicted. Eventually, he decides to break free and find his own strength.
One common theme is redemption. Tom, often portrayed as a villain in the original story, may seek redemption through his relationship with Harry. For example, in some fics, Tom realizes the error of his ways with Harry's influence.
Overcoming challenges is also a big theme. The mpreg brings about many difficulties, such as dealing with the magical world's reactions, their own insecurities, and taking care of the new life. These stories usually show how they face and conquer these problems.
A common theme is the protection of the unborn child. Given that it's a mpreg situation, both Tom and Harry will be very protective. This can lead to some tense and heart - warming moments in the story. Additionally, the theme of discovery is also there. They are discovering new aspects of each other and themselves as they go through the pregnancy journey. It's not just about the physical changes but also the emotional and mental growth that comes with it.
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.
A common theme is transformation. Since it involves animagus, the physical and emotional transformation of the characters, especially Harry, is often explored. For example, how his new form affects his relationship with Tom.
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.
Friendship and rivalry are also common themes. They might be rivals in some aspects, but through the diary, they start to form a bond that could be considered a friendship. And there's also the theme of growth. As they write in the diary, they grow as characters, making different decisions based on what they've written and thought about.
Well, a common theme is the exploration of their different upbringings. Harry grew up in a non - magical family until he discovered his wizarding heritage, while Tom had a difficult childhood in an orphanage. Fanfiction might play with how these different starts in life could lead to different relationships between them. Also, there are fictions that focus on their magical abilities and how they compare and contrast in terms of power and skill.
The theme of friendship or a complex relationship also runs through many 'harry x tom fanfic'. They are not just friends or enemies but something in - between. It could be a relationship based on mutual respect, despite their differences, or a relationship full of tension and conflict that still has a certain bond.