In Jiraiya's characterization in these fan fictions, his sense of responsibility towards Pain is often emphasized. He's not just a teacher but also a mentor who deeply cares about Pain's future. His determination to bring Pain back to the right path is a key trait. For Pain, his internal struggle between his loyalty to Jiraiya's teachings and his new - found beliefs in causing pain for peace is usually explored.
The plot in such fan fictions usually dives deep into their ideological differences. Jiraiya stands for traditional ninja values like loyalty and hard work, while Pain has his own view of peace through pain. Fan fictions might create scenarios where they have to face off not just physically but also in a battle of wits and beliefs. For example, Jiraiya could try to convince Pain that his way of achieving peace is wrong by showing him the positive aspects of the ninja world that Pain has overlooked.
The 'jiraiya vs pain' in RWBY fanfiction could be a battle of wits as much as a battle of powers. Jiraiya is a very experienced ninja, and Pain has his own ideology - driven powers. In a RWBY setting, the battle could be affected by things like Dust, the special energy source in RWBY. Jiraiya might be confused by this new element at first, while Pain could try to incorporate it into his attacks. It would be a clash of two different power systems and fighting styles.
Perhaps in this fanfiction, Jiraiya discovers that Naruto is going to be the cause of a major catastrophe in the future. He might have seen a prophecy or some sort of sign that convinces him Naruto has to die to prevent this. It could also be that Jiraiya has been misled by false information about Naruto, which makes him think that Naruto has become an evil force that needs to be eliminated.
It's really hard to say who would win. Jiraiya has his Sage Mode which gives him enhanced strength, speed, and perception. But Pain has the Rinnegan which allows him to use powerful abilities like the Six Paths techniques. In the RWBY fanfiction context, it might depend on how well they adapt to the RWBY world. If Jiraiya can quickly figure out how to use Dust to his advantage, he might have an edge. But if Pain can use his powers to disrupt the balance of the RWBY world, he could also come out on top.
The reason why Hideki killed Dylin was because Dylin had rebelled within the family and killed the chief of the family, Sanxing, as well as other important members. Dylin rebelled because the Zi Chuan family did not trust him, and as the commander, he had to quell the rebellion. As the heir of the Zichuan family, Zichuan Ning escaped to the Far East and asked for help from Zichuan Xiu to defeat Dylin and take back the capital. In the end, Hideki attacked Dylin. After an intense battle, Dylin was defeated. Hideki supported Hideki and returned to the Imperial Capital. As for the specific motive and background, the search results did not mention it.
There were two possible reasons Ku He wanted to kill Xiao En. The first possibility was that Xiao En knew Ku He's unspeakable secret. Back then, Ku He was so hungry that he wanted to feed on humans, and Xiao En had witnessed that scene with his own eyes. In order to protect his reputation, Ku He did not want Xiao En to reveal this secret, so he decided to kill Xiao En. The other possibility was that when Xiao En and Ku He were searching for the temple together, Ku He had obtained a martial arts manual from Ye Qingmei, which had allowed him to break through the boundary and become a Great Grandmaster. Ku He was grateful to Ye Qingmei and knelt down to her. If Ye Qingmei had not revealed this secret, Ku He might not have killed Xiao En. However, the specific reason might need to be further watched to understand.
The reason why Destiny killed her clone was to help her brother change his fate. Tianming was the strongest of the four avatars of the protagonist Ye Xuan's sister, Qing 'er. In her previous life, Qing 'er's brother gave her the last steamed bun to eat, and he starved to death. Therefore, the destiny left behind a strong obsession to find his brother and protect him. Tianming was extremely powerful. She could kill people with a single sword strike. In order to help her brother defy the heavens and change fate, she carried out a large number of massacres and even destroyed an entire planet with a single sword strike. However, the other two clones did not agree with her defying the law and thought that she had killed too many people. Thus, Tianming decided to kill these two clones. In short, the reason why Destiny killed the clone was to find her brother and protect him, as well as to help her brother change his fate.
There were two possible reasons Ku He wanted to kill Xiao En. The first possibility was that Xiao En knew Ku He's unspeakable secret. Back then, Ku He was so hungry that he wanted to feed on humans, and Xiao En had witnessed that scene with his own eyes. In order to protect his reputation, Ku He did not want Xiao En to reveal this secret, so he decided to kill Xiao En. The second possibility was that Ku He wanted to keep the temple a secret and didn't want anyone to know about its existence. Xiao En and Ku He had rescued Ye Qingmei together, so Xiao En also knew the secret of the temple. Ku He was worried that Xiao En would reveal the secret of the temple, so he decided to kill Xiao En. These are the possible reasons based on the search results provided. The specific plot and details may require further reading to obtain a more accurate answer.