Well, in a 'natsu speaks dragon fanfiction', it might center around Natsu's discovery of the ability to speak dragon. This could lead to him uncovering secrets about his past, as dragons are often linked to his heritage in the original series. He could use this new - found skill to form alliances with dragons or solve mysteries that were previously unanswerable.
Natsu would surely be one of the main characters since it's about him speaking dragon. There might also be some dragons as main characters, like Igneel if he's still alive in the fanfiction's storyline.
A common theme is self - discovery. Natsu often learns more about himself through his connection to the dragon language. Another theme is power. His ability to speak the dragon language sometimes gives him access to new powers or a deeper understanding of his existing powers.
One popular 'natsu speaks dragon language fanfiction' might be 'The Dragon's Tongue'. It delves into how Natsu's ability to speak the dragon language affects his relationships within the guild. Another could be 'Dragon Words, Hidden Powers' which focuses on the secrets Natsu uncovers through his dragon language skills.
Well, when Merlin speaks dragon language in fanfiction, it might be a way to show his special connection to the magical world. Maybe it's a sign of his growing power. He could use it to unlock hidden secrets or ancient magic that only the dragons know about. This can create really exciting storylines where Merlin is the only one who can communicate with these powerful and ancient creatures.
It could be a water - based dragon. In that case, Natsu might have some water - related magic in addition to his fire magic. This would make him a very unique character as he would be able to combine two opposing elements in a way that no one else in the Fairy Tail guild could.
You can start by looking on popular fanfiction websites such as FanFiction.net or Archive of Our Own (AO3). These platforms have a vast collection of Harry Potter fanfictions, and you can use the search function to specifically look for ones related to 'harry speaks dragon'. Just type in the relevant keywords and browse through the results.
Gray might show up too. He could start as a bit of a rival, not believing that Natsu can really achieve great things with this Dragon God training. But as the story progresses, he could become more of a supporter. And then there's Lucy. She might be worried about Natsu during the training, and also use her celestial spirit magic to help Natsu in some unexpected ways during his training, like summoning spirits that can provide unique challenges for Natsu to overcome.
Potentially, we could see some celestial dragon characters. They might be ancient and powerful beings. Some could be friendly towards Natsu, seeing him as a new hope for their kind. Others might be more hostile, seeing him as an intruder or a threat to their traditional ways. There could also be other mages from different guilds who are either curious or envious of Natsu's situation with the celestial dragons.
Happy, Natsu's flying cat companion, would definitely be a main character. He would be there to provide comic relief as always, but also be a source of emotional support for Natsu during his transformation into a dragon god. Erza might also be a prominent character. With her strong leadership skills and powerful magic, she could be guiding the guild during the times when Natsu is still coming to terms with his powers and the changes it brings to the guild.