One interesting plot could be the slayer having to overcome their own inner demons while facing the hellfire dragon. Maybe they've been haunted by past failures and must find the strength within to succeed.
One interesting concept could be the unique powers of the Hellfire Dragon Slayer. Maybe they can create and control hellfire in ways that are different from regular fire magic in the Fairy Tail universe. For example, the hellfire might have the ability to burn through magical defenses more easily.
Typically, the main character is the dragon slayer. They are often a brave and determined individual with unique skills and a strong will.
One great 'hellfire dragon slayer fanfic' could be about a young hero who discovers they have the unique ability to slay hellfire dragons. They embark on a journey filled with challenges and self - discovery. Another might focus on the backstory of the hellfire dragons and how they came to be such feared creatures in the fanfic's universe.
Another plot might involve Natsu losing his dragon slaying powers temporarily. He then has to rely on his wits and the help of his friends in Fairy Tail. This could lead to some really heartwarming moments as his friends support him, and also some tense battles where they all have to fight together without Natsu's usual brute strength.
In some 'hellfire dragon slayer fanfic', there could be a powerful wizard as a main character. This wizard might not be a direct slayer but has the knowledge and power to help the slayer in their quest. And of course, the hellfire dragons can be considered main characters in a way, as their actions and nature drive much of the story's conflict.
One interesting plot could be Natsu facing a new, extremely powerful dragon that is immune to his regular attacks. This forces him to discover a new form or power within himself. Another plot might involve Natsu traveling to a different dimension where the rules of dragon slaying are completely different and he has to adapt quickly.
One interesting plot could be the Poison Dragon Slayer character teaming up with Naruto to take on a new, powerful enemy that threatens both their worlds. Maybe this enemy has a unique ability that can only be countered by combining the skills of the Naruto universe and the Poison Dragon Slayer magic.
Another plot could involve a character from Naruto learning the ways of the Fire Dragon Slayer. Say Sasuke discovers the power of the Fire Dragon Slayer magic. He could use it to enhance his already formidable fire - based jutsu. This would not only change his fighting style but also his relationships with other characters. His new power might make him a target for those who want to harness the Fire Dragon Slayer magic for their own evil purposes.
It could be a dark wizard who wants to steal the power of the Hellfire Dragon Slayer. This wizard might be from a long - lost cult that once worshipped the dragons but now wants to use their power for evil. They could see the slayer as a key to unlocking some ancient and dangerous magic.
Well, there might be a plot where the slayer discovers a hidden prophecy in the wizarding world that links their slayer destiny with the fate of Hogwarts. This could lead to a journey of uncovering secrets and ancient magic that was long forgotten. Also, a plot could involve the slayer having to deal with a new type of dark creature that is a combination of a magical beast and a demon, and they have to use both their wizarding knowledge and slayer skills to defeat it.