One popular plot type is the Ice Dragon's relationship with other characters in Fairy Tail. Maybe there's a love story between the Ice Dragon slayer and another guild member. Or perhaps the Ice Dragon has to train a new generation of mages in the ways of ice magic, which brings in elements of mentorship and character growth. There could also be a plot where the Ice Dragon is in a conflict with a powerful villain who wants to steal its power for evil purposes, and the Fairy Tail guild has to protect it.
There are fanfictions where the Ice Dragon has a connection to a lost realm within the Fairy Tail universe. The main character, perhaps a young mage, has to team up with the Ice Dragon to explore this realm and uncover its secrets. This often leads to all sorts of adventures, battles against strange creatures, and the discovery of new magic. In some plots, the Ice Dragon is actually a reincarnation of an ancient Fairy Tail hero, and the story unfolds as they regain their memories and powers, which is really fascinating.
You can start by searching directly on DeviantArt. Use relevant keywords like 'Ice Dragon Fairy Tail' in the search bar. Also, check out fanfiction communities and forums dedicated to Fairy Tail. They might have links or discussions about great Ice Dragon - related fanfictions on DeviantArt.
One really engaging plot is when the dragon - turned - human has to learn about human relationships. In a fanfic I read, the dragon - turned - human was completely clueless about friendship and love. He thought that loyalty in the dragon world was the same as in the human world, but he soon learned that human relationships are much more complex. There are also plots where the dragon - turned - human has to prove themselves to the Fairy Tail guild. They are seen as an outsider at first, and they have to show that they are worthy of being part of the guild, which often leads to exciting adventures and battles.
Well, one interesting plot could be the dragon slayers teaming up against an ancient and powerful dragon that was thought to be a myth. They might have to discover new magic powers within themselves to stand a chance.
One more interesting plot could be that the Fairy Tail guild decides to put on a play based on the story of Jane Eyre. However, as they start rehearsing, the characters start to actually live out the emotions and experiences of the Jane Eyre characters in real life. So, the normally carefree mages of Fairy Tail have to deal with the complex relationships, class differences, and emotional turmoil that are central to Jane Eyre.
One interesting plot could be Naruto having to prove himself in Fairy Tail's guild. Since he's from a different world with different powers, the members might be skeptical. He'd have to show that his ninja skills are just as valuable as their magic. Another plot could be him finding a way to combine his chakra with magic. It would be really cool to see how he uses this new power to fight against common enemies.
A really cool plot would be if the Demkn has the power to steal the dragon's magic for a short time. So the dragon has to fight without its main source of power, which makes for a very different and exciting battle. And as the battle progresses, the dragon discovers a new way to use its physical strength and the environment to its advantage. There could also be a plot where the Demkn is a creation of an evil wizard to specifically target dragons. The dragon then has to not only fight the Demkn but also figure out who is behind its creation and stop them before more Demkn are created.
One interesting 'Fairy Tail' fanfiction on DeviantArt could be those that explore alternate universes. For example, a story where the characters have different magic abilities or the guild is set in a modern - day city instead of a medieval - like world. Another type might be ones that focus on character relationships in more depth, like a detailed exploration of Natsu and Lucy's relationship evolving in unexpected ways.
Well, she could start off being an outcast in Fairy Tail because her ice powers seem so different from the rest. But then she proves her worth by using her ice dragon slayer magic to save the guild from a powerful water - based enemy. The ice would counter the water and she'd become a hero.
Lucy as an Ice Dragon Slayer could have a very different story arc. Her magic could attract the attention of dark guilds who want to use her power for their own evil purposes. She would then have to fight not only to protect herself but also the people she loves in Fairy Tail. Her training to become a stronger ice dragon slayer would involve learning how to control the cold and use it in combat in the most effective ways.
The discovery of the origin of the Ice Dragon Slayer powers in the context of the Fairy Tail world could be really exciting. Maybe there's a connection to some ancient magic in the Fairy Tail universe. Also, when the Naruto character starts to form deep bonds with certain Fairy Tail members, like Natsu or Lucy. Their interactions and how they grow together as friends or comrades is a great plot point.