One of the most popular is 'Naruto Shippuden: Sakura Hiden - Thoughts of Love, Riding Upon a Spring Breeze'. It's popular because it shows Sakura in a new light, with her own adventures and growth.
I don't think it's strange at all. Naruto is a very curious person. Fanfiction can offer new perspectives on his own life and the lives of his friends. He might learn something new about himself or get inspired by the creative ideas in the fanfiction. It could also be a form of entertainment for him during his downtime.
A Naruto x Hinata fanfiction could focus on a mission they go on together during Naruto Shippuden. They are forced to rely on each other in a dangerous situation. Hinata gets injured protecting Naruto, and Naruto is filled with a new - found determination to protect her. This experience deepens their bond, and Naruto starts to see Hinata in a whole new light, leading to the start of their romantic relationship.
Well, normal Naruto Shippuden fanfics are likely to be centered around the adventures, growth, and battles of the characters. They might explore different what - if scenarios within the framework of the Naruto universe. But 'naruto shippuden diaper fanfic' is likely to be more of a novelty or a very specific and strange take on the characters. It might not have the same depth or connection to the original story as normal fanfics do. For example, normal fanfics could focus on how a character overcomes a difficult battle, while a 'diaper fanfic' would be more about a really odd situation involving diapers which has little to do with the main Naruto themes.
Another interesting novel is 'Naruto Shippuden: Kakashi Hiden - Lightning in the Icy Sky'. It focuses on Kakashi's story and his past, which is really fascinating. There are a lot of details about his relationships and his growth as a ninja.
The plot of the 16th episode of the second season of the year of celebration revolved around Fan Xian's return with the diplomatic mission. The Second Prince threatened Fan Xian with the safety of Fei Jie, Fan Sizhe, and the Teng family's orphan in an attempt to force him to lower his head to him. Fan Xian faced the Baoyue Brothel maze and the spring examinations crisis. These were all traps set by the Second Prince. In addition, Fan Xian also took over the palace treasury. He discovered that the palace treasury was heavily in debt, so he decided to rely on his own power to resolve the palace treasury crisis. Fan Xian and Lin Wan 'er held a grand wedding, but then the Qing Emperor suffered three assassination attempts. Fan Xian's rescue resulted in his martial arts being completely crippled.
In the second episode of the second season, Fan Xian came to the Eastern Palace to meet the Crown Prince and tell him about the Second Prince and Eldest Princess smuggling in Northern Qi. Fan Xian said that if he wanted to find evidence, he had to go to a place called Shijia Town.