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.
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.
Build complex characters that have depth and growth. Their decisions and reactions drive the plot forward. Also, introduce unexpected twists to keep things interesting.
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.
The unique plot twists and unexpected character developments in it make it stand out. The way the story unfolds keeps readers on the edge of their seats.
I'm not sure of the lyrics off the top of my head. Maybe check music streaming services or ask on music forums, and you're likely to find the lyrics you're looking for.