It could be developed in terms of its range. In the original, it had a certain limit, but in fanfiction, you could make it so that with enough training, the user can extend the range significantly. This would open up new possibilities for battles and strategic planning. Also, the bloodline could be developed to have a secondary effect, like leaving behind a trace of chakra that can be used for tracking or as a trap for enemies.
One way to develop the Flying Thunder God bloodline in fanfiction is to explore its connection to other aspects of the Naruto universe. Maybe it has a link to the Sage of Six Paths' power. The character with this bloodline could start to have visions or gain abilities related to the Sage. They could also learn to combine it with other nature - based chakra, like lightning or wind, to create unique and devastating attacks. This would not only make the bloodline more powerful but also more interesting as it ties into the larger mythology of the Naruto world.
If you want the clearest chapter reference, go to Chapter 76. Early on, Thinking of this, the aunt repeatedly praised, "Girl, hearing your words...; later, the chapter leans on I'll go back and tell this to my child; he will definitely be motivated to....
The best chapter pointer here is Chapter 15, "The Autistic Teen Jiang Shixu". It opens with Jiang Shixu woke up from those nightmares filled with blood and darkness,... and closes on Since she didn't move, Jiang Shixu also stayed put, and the kitchen, which....
Look to Chapter 58 for the clearest answer. It begins with Facing Jiang Yan's triple barrage of questions, Jiang Li's only response..., keeps building through After a long while, she yawned indifferently and said, "I didn't pick up..., and lands on By ten o'clock, Jiang Yan was still wandering.
Look to Chapter 28 for the clearest answer. It begins with The next evening, Jiang Yan drove home seething with rage., keeps building through Before he even entered the dining room, he shouted angrily, "Lili, you did..., and lands on Lili then kicked his knee hard..
If you want the clearest chapter reference, go to Chapter 18. Early on, In the corner, a girl in a black dress sat quietly, holding a glass of...; later, the chapter leans on Her serene yet cold temperament, along with her exquisitely beautiful....
Look to Chapter 22 for the clearest answer. It begins with Hearing this, Su Yinwan looked at Shang Shaojing with a face full of..., keeps building through Shang, but it's not necessary;
If you want the clearest chapter reference, go to Chapter 16. Early on, Just as the words fell, Jiang Shixu swiftly cast his eyes downward.; later, the chapter leans on His eyelashes were very long; when they fell, they could cast a small....
Chapter 20 is the strongest chapter-level answer because it starts from Several people turned their heads upon hearing the sound and saw three... and follows through on So, he turned and questioned Jiang Li..
Chapter 24 is the strongest chapter-level answer because it starts from Not only that, even the non-mainstream photos she had previously posted on... and follows through on Shi Xu rarely feels like going out, so that's nice." Aware that he....
If you want the clearest chapter reference, go to Chapter 59. Early on, After walking for about two or three hundred meters, the old man stopped...; later, the chapter leans on Jiang Yan followed his pointing direction and was instantly dumbfounded..