Well, it could be about Naruto characters involved with black flames in some unique way. Maybe it's a story where a character discovers a new jutsu related to black flames, or perhaps it's about a villain who uses black flames to cause chaos in the Naruto world.
It's hard to say for sure without reading it, but it could be Naruto himself as he often takes center stage in fanfictions. He might be the one trying to figure out the mystery behind the black flames.
In fantasy novels, green flames, blue flames, and black flames were often used to describe different emotions and states.
Green flames were usually seen as a calm and gentle color that represented a peaceful and peaceful state. It was often used to describe the state of some cultivators or immortals because they had usually reached a certain realm where they could control the power of fire and use it in a peaceful way.
Blue flames were usually seen as a strong and powerful color, representing a state of passion and power. It is often used to describe the state of some powerful warriors or demons because they usually have powerful fire abilities and can use fire in a passionate manner.
Black flames were usually seen as a deep and terrifying color that represented a state of destruction and death. It is often used to describe the state of evil forces or demons because they usually have great fire power and can use fire in terrifying ways.
It should be noted that these colors are not necessarily fixed. They may change as the story develops.
I'm not sure as it's a fanfiction. But it could be an original character created by the author who is somehow related to the black flames, like a person who has the power to control them.
It could be about many things. Maybe it's about a character or a group of characters who witness the rise of black flames in a fictional world. These black flames might symbolize danger, power, or a new era in the story's setting.
I recommend "Fire Devouring Martial Arts" to you. The protagonist of this fantasy novel uses devouring flames as a cultivation method. He controls the three thousand flames in the world and cultivates to the master level of body refining techniques. Not only did he cultivate some ordinary flames, but he also mastered various special flames, including black flames and colorless flames. I hope you like this fairy's recommendation. Muah ~😗
He could learn through intense meditation. Just like how he trained to control the Nine - Tails' chakra. By focusing his mind and reaching a state of inner calm, he can better direct the white flames. This would require discipline and concentration.
Well, it could be related to some ancient power or bloodline limit that Naruto discovers. In fanfiction, authors often create new backstories. So, perhaps Naruto's white flames are connected to a long - lost clan whose power was sealed away. And now, through some twist of fate, Naruto unlocks this power and the white flames are a symbol of his new - found heritage.
In some fanfictions, the Dying Will Flames might be used to represent the unwavering will of a ninja. For example, a character on the verge of death could have their Dying Will Flames flare up, giving them the strength to keep fighting or to protect their comrades. This could add a new layer of depth to the Naruto characters we already know and love.
Some characters might develop by learning to control the Dying Will Flames. This could be a difficult process, similar to how Naruto had to learn to control his chakra. Through this, they grow in strength and confidence.