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.
A shadow dragon might be the one. This would give Natsu the ability to manipulate shadows as well as fire. He could use the shadows for stealth or to create illusions, adding a whole new dimension to his fighting style. And his personality might be a bit darker, influenced by the nature of the shadow dragon.
One possible plot could be that Natsu is raised by a dragon other than Igneel. This new dragon might have different values and teachings. For example, if it was a more reclusive dragon, Natsu might be less outgoing and more reserved compared to his canon self. The dragon could also teach Natsu different types of magic, which would change the way he fights and interacts with others in the Fairy Tail guild.
In a fanfic where Natsu is raised by a light - dragon, his character would develop in a very different way. The light - dragon's influence would likely make him more of a beacon of hope. He would be more focused on justice and helping others in a more positive, guiding light - kind of way. His powers would be different, and he would have to learn to control light - based abilities. This would require a different kind of self - discipline compared to controlling fire. His relationships would also be affected. For instance, he might be more of a role model to the younger members of the guild, and his interactions with his enemies would be more about converting them to the side of good rather than just defeating them.
He might be more in tune with nature. Since dragons are often associated with nature, Natsu could have a deeper respect and understanding of the natural world around him, showing more kindness to animals and plants.
There could be other Fairy Tail members as main characters too. They might play important roles in Natsu's new adventures. For instance, Lucy could be there to support Natsu with her celestial spirit magic. Gray might also be involved, adding his ice - make magic to the mix and having some interesting interactions with Natsu's new dragon - related situations.
Maybe it's an ancient and powerful dragon that has been in hiding for a long time. This dragon decides to raise Natsu for some prophecy - related reasons. It could be that the dragon believes Natsu is the key to saving the dragon or human world from a great danger.
One possible plot could be that Natsu is raised by a water - dragon instead of Igneel. This would give him different elemental powers and a different personality. He might be more calm and collected, having the influence of the water - dragon's nature. He could also have a different relationship with his guildmates, as his powers would interact differently with theirs.
I'm not sure specifically as it could vary greatly. It might be a fanfic about Natsu from 'Fairy Tail' who is a different kind of dragon, perhaps with unique powers or a different origin story compared to the original.
Maybe it's another dragon, a malevolent one, who sees the female dragon's act of raising a human as an abomination. He decides to target Natsu to prove a point or to gain power over the female dragon. The malevolent dragon could try to undermine Natsu at every turn, creating numerous challenges for him.
In 'natsu different dragon fanfiction', it could be exciting to see how Natsu's character develops differently. Perhaps he has to face challenges that are unique to this fan - created version. For example, he might have to deal with a new type of dragon magic that forces him to grow in unexpected ways. This could lead to new character arcs and interactions with the other characters in the Fairy Tail universe.
One possible plot could be that Natsu, while being raised by the female dragon, learns unique dragon magic that is different from what he would have learned otherwise. He might develop a special bond with the dragon, like a mother - son relationship, and the story could follow his adventures as he uses the skills taught by the dragon to protect the dragon's lair or the surrounding area from threats.