I'm sorry, without actually reading the 'Paha Istri a Naruto Fanfic' it's hard to say exactly what the plot is. It could potentially be about a new character named Paha Istri's adventures in the Naruto world. Maybe it involves her interacting with the main characters, getting involved in ninja battles, or even falling in love with one of the Naruto characters.
Ku He was a character in the TV series " Celebrating Years ", played by Liu Hua.
In the movie, Ku He was Xiao En's lover, the master of the Northern Qi Kingdom. They had gone through many hardships while searching for the temple together, but were later saved by Ye Qingmei. After Ku He drank the " heavenly dew " that Ye Qingmei had given him, he obtained powerful skills and became a great grandmaster.
In the original novel," Celebrating Years," Ku He was Xiao En's good friend. He was the Imperial Advisor of Northern Qi. He and Xiao En searched for the temple together and finally cultivated to become a Great Grandmaster. In the movie, Ku He was Xiao En's savior. He and Xiao En searched for the temple together and eventually became a Great Grandmaster. Ku He was an ambitious person. In order to achieve his goal, he would do anything, even sacrificing his own disciple.
Thus, Ku He was a character that was both good and evil. His actions and motives were hard to fathom.
Well, 'Naruto' has a vast fanfic universe. You could try looking on popular fanfic platforms like FanFiction.net or Archive of Our Own. Just search for 'Paha Istri' within the Naruto fanfic section. There might be some interesting stories there that explore unique plotlines or character relationships.
Master Ku He's ending in " Celebrating Years " was that he was defeated and heavily injured by the Qing Emperor in the battle of Dong Mountain. He eventually died at the Qing Emperor's hands. Before he died, he asked Haitang Duoduo to go to Xi Hu to help Chanyu build a country, so as to prevent the Qing Kingdom from sending troops to Northern Qi.