Obviously, Natsu is one of the main characters as it's in the title. He is likely to be the central figure around which the story revolves. There might also be other dragons that play important roles, like his dragon family members if they are introduced in the fanfiction.
One interesting storyline could be Natsu's journey to discover his true dragon heritage in a more in - depth way. Maybe he uncovers secrets about his dragon family that were previously unknown. Another could be his adventures in a new dragon - ruled realm where he has to prove himself as a prince.
They could be two well - known dragons from the original lore. Maybe Igneel, Natsu's father figure dragon, and another powerful dragon like Acnologia. However, in fanfiction, they could also be completely new dragons created by the author.
Well, in many fanfictions, it could be Igneel and another dragon like Metalicana. Igneel is Natsu's adoptive father in the original series, and Metalicana is Gajeel's dragon. Combining them in a fanfiction as Natsu's caretakers could lead to some really interesting character dynamics.
Igneel could be one of the main dragons. Since he has a connection with Natsu in the original story, it would make sense for him to be among the dragons raising Natsu. Another could be Metalicana, as he is also a well - known dragon. Grandine might also be there, considering her importance in the Fairy Tail universe.
Lucy might also be an ally. She has her celestial spirits that could be a great help. For example, some of the spirits like Leo could be very powerful in combat against the dragons. Also, Erza would be a great addition. With her various armors and combat skills, she could hold off a large number of dragons while Natsu focuses on the more powerful ones among the 10000.
There could be some new dragon characters created specifically for this fanfiction. These dragons might have unique abilities and characteristics that are different from the known dragons in the original Fairy Tail series. And perhaps there are some wise old wizards or spirits in the fanfiction who guide Natsu in between his dragon - training sessions.
Well, perhaps Natsu uses his powerful fire magic to take on the dragons one by one. He might start by finding a strategic location to face them, like on top of a large mountain where he has a better view. Then, he'd use his signature moves like Fire Dragon's Roar to blast groups of dragons at a time.
One possible plot could be that Natsu gains unique and powerful magic abilities under the tutelage of the two dragons. He might learn different combat techniques and ways to control his fire magic more precisely.