It could be a new character, like a young orphan who discovers their Smoke Release ability and then tries to find their place in the ninja world. They might face discrimination at first because of their unknown origin and unique power, but eventually prove themselves.
Maybe an existing minor character from the Naruto series, such as Ebisu. Imagine if he had a hidden Smoke Release ability that he had to develop in order to face a new threat. His comical nature could add an interesting twist to the story as he tries to be serious about mastering this new power.
A fanfic could focus on a group of ninjas who specialize in Smoke Release and form a special unit. They are sent on secret missions where their ability to blend in with the smoke and move undetected is crucial. Their relationships and how they work together could be explored, as well as the challenges they face against opponents with different elemental abilities.
It could be an original character. A young ninja from a small, unremarkable clan who discovers they have the Steel Release ability. This character would then have to navigate the complex world of the Naruto universe, facing both the admiration and envy of other ninjas.
In certain Naruto fanfics, the authors might give Naruto the habit of smoking to show his more grown - up or rebellious side. It could be part of a darker or more mature interpretation of his character. But it's important to note that this is not in line with the canonical Naruto we know from the anime and manga, which focuses on his ninja skills, his journey to become Hokage, and his relationships with his friends.
Well, in Naruto fanfic, it's quite common for writers to come up with new types of chakra - based abilities. 'Crystal release' could be one of those. It might be used by original characters created in the fanfic or even given to existing characters in new and interesting ways. For example, a character could use 'crystal release' to form defensive barriers or offensive weapons made of crystal, which can make the battles in the fanfic more exciting and different from what we see in the original Naruto series.
Naruto might become more strategic. Since the smoke jutsu can be used for both offense and defense, he would learn to time it better. For example, he could use it to blind opponents before launching a surprise attack. This would make him seem more calculating rather than just relying on brute force.
In these fanfics, one main feature is the unique combat scenarios. Since Chaos Release is a special power, it creates different battle dynamics compared to the normal Naruto battles. Also, the fanfics usually explore how the power of Chaos Release can change the power balance in the Naruto universe. It might make a previously weak character become strong or introduce new rivalries among characters.
It could be an old hermit who has been living in seclusion. This hermit has mastered crystal release and sees potential in Naruto. He decides to pass on his knowledge to Naruto, seeing him as a key to bringing peace to the ninja world.
A fanfic could also explore Naruto using the Smoke Jutsu for a rescue mission. Suppose some of his friends are trapped in a building surrounded by enemies. Naruto uses the Smoke Jutsu to cover the area. The smoke is so thick that the enemies can't see. Then he sneaks into the building, rescues his friends, and they all escape under the cover of the remaining smoke.
Well, in the fanfic, Naruto using crystal release could be part of a mission. Maybe he's in a land where crystal release is common among the enemies. He starts to study their techniques and somehow manages to adapt it to his own style. He could then use it to save his friends during a really tough fight. Like, he creates a huge crystal shield to protect everyone from a massive attack and then turns the shield into sharp projectiles to counter - attack.
One possible plot twist could be that Naruto's smoke jutsu actually hides a powerful secret technique. For example, instead of just being a simple smoke cover, it could be a way to teleport or to create clones that are undetectable within the smoke. Another twist might be that an enemy figures out a way to turn Naruto's smoke jutsu against him, perhaps by using the smoke to spread a harmful gas or illusion that affects Naruto when he uses the jutsu.