One idea could be a dragon that was once a servant of Sauron but breaks free from his control. It could then befriend a group of hobbits and help them on their journey. Dragons in Middle - earth are often depicted as powerful and fearsome creatures, so it would be interesting to see one turn good.
Perhaps the dragon could be a guardian of a long - lost treasure in Middle - earth. The main characters in the fanfiction could be on a quest to find this treasure, and they have to face the dragon. But instead of fighting, they manage to communicate with it and learn about the history of the treasure and the dragon's role in protecting it.
Another possibility is that the dragon is an outcast among its kind. It doesn't follow the typical dragon behavior of hoarding gold and being aggressive. Instead, it has a fascination with the races of Middle - earth like elves and humans. It could befriend an elf and together they explore different parts of Middle - earth, facing various challenges along the way.
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.
One idea could be to have Percy Jackson end up in Middle - earth. He could use his water - related powers to help in battles against Sauron's forces, like using water to put out dragon fire. His demigod skills would be a new element in the LOTR universe.
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.
Perhaps the One Ring could have an unexpected reaction to Naruto's chakra. It could either be attracted to it or repelled. This could create an interesting plot where Naruto has to deal with the power of the Ring while also trying to find a way back to his own world.
Yes, there are some great 'Lord of the Rings' dragon fanfictions. You can find them on various fanfiction websites. Some focus on creating new dragon characters within the Middle - earth setting, adding exciting adventures and interactions with the existing characters from the original story.
One idea could be a story about a young Gondorian soldier who discovers a long - lost artifact that holds the key to an ancient Gondorian power. He must then protect it from enemies both within and outside Gondor.
Another idea is to mix the magic systems. The rings of power in 'Lord of the Rings' could interact in some way with the Imperial Arms from 'Akame ga Kill'. Maybe a character finds a way to combine the power of a ring with an Imperial Arm, creating a new and extremely powerful weapon or ability.
A crossover with the Star Wars universe would also be cool. The Jedi could be like the wizards in Middle - earth. Maybe Aragorn could learn some lightsaber skills from the Jedi and use them against the orcs. And the Force could have an interesting interaction with the magic in Middle - earth.
One idea could be a vampire character who is drawn to the power of the One Ring. Maybe this vampire, being a creature of the night and often associated with darkness and power -hunger, sees the ring as a means to gain ultimate power in Middle - earth. For characters, you could have a half - vampire, half - elf who struggles with their dual nature while being caught in the events related to the ring.
One idea for a Yu - Gi - Oh GX Five - Headed Dragon fanfiction could be a story where the main character discovers a hidden power within the Five - Headed Dragon card. Maybe they find a way to summon it in a completely new and unexpected way, like through a combination of different spell cards that no one has ever thought of before.