The 'aang doesn't kill fanfiction' could be unique in terms of the relationships it portrays. Since Aang doesn't kill, it might show how his friends and foes react to this. Maybe some friends admire his resolve, while foes might underestimate him at first. This can lead to complex relationship dynamics that are different from the typical action - based stories where killing is more common.
It might be popular because it stays true to the essence of Aang's character. Fans who love the original show and Aang's pacifist nature would be drawn to it as it explores that side of him further.
One possible reason could be his strong moral and spiritual beliefs. Aang is a very spiritual character, and his culture and upbringing might have instilled in him the value of all life. Killing goes against his principles of peace and harmony.
Maybe it's a powerful jutsu or curse that doesn't eliminate the characters outright but instead forces them to find a way to adapt and survive, leading to interesting plot twists.
Often, it's the main character's inner strength and determination. They face tough challenges but don't give up, and that's what doesn't kill them.
His refusal can also build tension. Other characters might not understand his stance, or they might be frustrated by it. This can create conflict within the story, both between Aang and his allies, and between Aang and his enemies who might not expect his mercy. For example, some of his friends might think that killing a particularly dangerous enemy is the only way to ensure safety, but Aang stands firm, causing a rift in their relationships. This adds an extra layer of drama to the plot.
It could be a powerful enemy attack that the protagonist survives, toughening them up for future challenges.
The exploration of different universes is also cool. In aang and dbz fanfiction, we get to see how the rules and cultures of the Avatar world and the Dragon Ball Z world mesh together. For instance, how would the concept of the Dragon Balls work in the Avatar universe? Or how would the Avatar state compare to Super Saiyan forms? These kinds of ideas can lead to really creative and engaging stories that are full of surprises.
A unique aspect is that it can completely change the power dynamics. In the original, Bella's shyness sometimes made her seem vulnerable. But in this type of fanfiction, she can be a force to be reckoned with. For instance, in a love triangle situation, she can be the one who makes the decisive moves.
One aspect could be that it might explore a Naruto who is in a state of being 'untouchable' in a metaphorical sense. Maybe he has some sort of power or status that makes him unapproachable. For example, it could be a story where he is so powerful that other characters are in awe and can't physically or emotionally reach him.
Another aspect is how other characters react to her change. Some might be confused, some might try to bring back the old Sakura, and others might be intrigued by this new version of her. This can create a lot of interesting interactions and dialogues in the fanfiction.