Not necessarily. There are many fictional characters with incredibly powerful abilities and it's hard to say for sure if Doom Slayer is the absolute strongest.
The strongest dragon in history was Tyrannosaurus Rex. Tyrannosaurus Rex was one of the largest carnivorous dinosaurs. It had superb hearing, smell, and vision, as well as sharp teeth and amazing bite force. Its body length could reach 15 meters, its weight could reach up to 18 tons, and its bite force could reach 3600 kilograms. It was one of the most powerful dinosaurs currently known.
One common theme is heroism. The dragon slayer is often seen as a hero, brave enough to face a powerful and dangerous foe. Another theme is coming - of - age. In many such novels, the protagonist starts as a young or inexperienced person and through the act of slaying the dragon, they grow and mature. For example, in 'Eragon', Eragon goes from a simple farm boy to a powerful dragon rider.
In fanfiction, dragon slayer magic might be outlawed to create more interesting plot twists. For example, it could make the protagonist's journey more difficult as they have to find alternative ways to deal with threats. It also adds a sense of danger and mystery. If everyone could use dragon slayer magic freely, the story might become too predictable.
😋I recommend When the Dragon Slayer Becomes an Evil Dragon to you! The main character of this book was a dragon slayer heir. He had the resurrection system and wanted to resurrect his dragon slayer. However, he later discovered that the Dragon Slayer actually wanted to sacrifice his own successor to resurrect himself. This is a light novel, a funny and dissing novel! I hope you like this fairy's recommendation. Muah ~😗
It really depends on your perspective. Some might think Drogon from 'Game of Thrones' is the mightiest due to his size and firepower. But it's subjective and varies from one story to another.
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 common theme is power - up. Naruto gets new abilities related to dragon slaying. Another could be friendship, like how Naruto's relationships change when he enters the dragon slayer world.
There are indeed. These fanfictions often take the characteristics of Naruto characters and blend them with the elements from Dragon Slayer. For example, Naruto might gain some abilities similar to those of the dragon slayers. It can be really exciting to see how the author weaves these two different universes together. You can start by searching on popular fanfiction websites using relevant keywords.