One common theme is the adventure. Just like in the original works, characters from both universes often embark on grand adventures together. For example, Harry Potter characters might join the Fellowship of the Ring on their quest.
One common theme is the power of friendship. In both original works, friendship plays a huge role, and in fanfiction, it's often explored further. For example, in crossovers, characters from both universes form new friendships based on shared values.
One common theme is the corruption of innocence. Since Harry starts as a child, it shows how his initial pure and naive self can be influenced by the allure of dark magic. Another theme is the power struggle. As he becomes a 'dark lord', there are battles for control within the wizarding world.
One common theme is the clash of different magic systems. Harry Potter's magic is more about spells and potions, while the magic in Lord of the Rings is more ethereal. Another is the idea of a hero's journey. Both universes have characters on quests, and these fanfictions often combine those journeys.
Many fanfiction writers are attracted to dragons in these universes because they are such iconic and powerful creatures. In the context of combining Harry Potter and Lord of the Rings, a dragon could be a bridge between the two worlds, maybe a dragon that was once in Middle - earth but somehow ended up in the wizarding world of Harry Potter, creating all sorts of interesting storylines.
Another theme is the isolation of the character. A 'dark child' Harry would likely be shunned or feared by others in the wizarding world. So, the fanfictions usually depict Harry being alone or having only a few allies who understand his darker nature. This can lead to a lot of internal conflict within Harry as he tries to find his place in a world that doesn't accept him. Also, the theme of redemption might be present. Even though he's a 'dark child', there could be a journey towards redemption as he realizes the consequences of his actions and tries to make amends, which can make for a very complex and engaging story.
One common theme is power. As Lord Potter, Harry has more power, and fanfictions often explore how he uses or misuses it. Another is identity, as he has to adapt to this new title.
One idea could be a crossover where the characters from Harry Potter are transported to Middle - earth. For example, Harry could meet Aragorn and they could exchange knowledge about magic and leadership. Harry's magic could be a new and strange power in Middle - earth, and Aragorn's warrior skills and wisdom could inspire Harry.
Dragons in these fanfictions can also represent power. In Harry Potter, a dragon might be a symbol of the raw, unbridled power that wizards have to control. In Lord of the Rings, a dragon's power could be related to the balance of good and evil in Middle - earth. If a dragon is awakened, it could tip the scales in the wrong direction, or if it's tamed, it could be a great asset to the good side.
Some libraries might also have self - published collections of fanfiction, although it's less common. You could also check with local book clubs that focus on fantasy literature. They might be aware of some child - friendly Harry Potter and Lord of the Rings fanfiction. Additionally, following some popular fanfiction authors on social media platforms might lead you to their works that fit this criteria.
One common theme is self - discovery. Many original characters in the fanfiction are on a journey to find out who they are in the context of Middle - earth. For example, an OC might be a human with some elven blood and they are trying to understand both parts of their heritage.