The novel I recommend to you is " Hong Kong Reborn: Entertainment Tycoon ". The novel told the story of a Chinese journalist who died on a mission and was reborn. His soul traveled to Hong Kong in 1985 and became the protagonist named Li Yangshu. In this story, Li Yangshu looked at the familiar streets and characters in Hong Kong movies and shouted excitedly," Xiangjiang, I came, I saw, I love." The main character in this novel has started to lose his arm, which might meet your needs.
I recommend you to read the two novels,'Sweet Oxide', and' There's a Dragon on Him.' " Sweet oxygen " was a novel about a tattoo artist. The author was Zhang Yuqing. On the other hand," There's a Dragon on Him " was a novel with tattoos as its theme. The male protagonist was a retired soldier with a real dragon tattoo. These two novels both involve the male protagonist having a tattoo. I hope you will like them.
Maybe he was protecting someone in Wave. He's always the self - sacrificing type, so he could have put himself in harm's way to save a villager or a friend.
Maybe he starts to train with one - armed techniques. He could learn from other one - armed ninjas if there are any in the fanfiction world. His friends would also play a big role. They might encourage him to keep going or help him in his training.
Another possibility is that Naruto and Yang have a special bond. This bond could be formed through shared experiences, like they both went through a difficult training together or survived a life - threatening situation. Because of this special connection, Naruto feels indebted to Yang or simply values Yang's life more than his own arm.