Definitely not. Harry Potter has its own independent story line, characters, and magic system. It's set in a world with Hogwarts, wizards, and the fight against Voldemort. Lord Inuyasha is about a different set of adventures in a world filled with demons and magic swords. They are two distinct entities and there's no way Harry Potter can be a fanfiction of Lord Inuyasha.
The Great Grandmasters 'endings during the Qing years were: The Qing Emperor was killed by Wu Zhu. Ku He died on Dong Mountain after being seriously injured by the Qing Emperor. Sigu Jian and Fan Xian joined forces to fight the Qing Emperor and also died on Dong Mountain. Ye Liuyun chose to live alone. As for the outcome of the fifth grandmaster, there was no relevant information in the search results provided, so it was impossible to know.
In " Celebrating Years," the four Grandmasters had different endings. The Qing Emperor was a hidden Great Grandmaster. In the end, under Fan Xian and Wu Zhu's joint attack, he was killed into the Royal Palace. However, as he broke free, he strangled Fan Ruoruo. Ku He was the Northern Qi Imperial Advisor. He died after being severely injured by the Qing Emperor. Ye Liuyun was a loyal subject of the Qing Emperor. In the end, he committed suicide under the Qing Emperor's orders. Sigu Jian was the guardian of Dongyi, the Sword Saint, and the most mysterious of the Four Great Grandmasters. His ending was not clearly stated in the original work, but he was considered the most carefree.
In " Celebrating Years," Si Lili ended up marrying the Northern Qi Emperor, Zhan Doudou, and became the imperial concubine of Northern Qi. In order to protect Zhan Doudou and Fan Xian's daughter, Red Bean Rice, she had taken on many responsibilities and difficulties. Si Lili's true identity was a Northern Qi spy in the Qing Kingdom and a Northern Qi imperial concubine. She used her identity as a courtesan to spy on Qing Kingdom's intelligence.
Concubine Liu's ending in " Celebrating Years " was full and happy. In the end, she became Madam Fan and managed the new palace treasury with Fan Jian, providing financial support for Fan Xian. Aunt Liu's position was firm and she did not suffer the fate of being chased out of Sheng Mansion. Her family was harmonious. She married the man she loved and lived a life of taking care of her husband and raising her children. Lady Liu was a simple and lucky woman. She did not have any sinister schemes and was sincere to Fan Xian, so she received a happy ending.
In " Celebrating Years," Zhan Doudou's ending was to continue to assume the position of Northern Qi Emperor and continue to disguise as a man. Because she had a daughter named Red Bean Rice, no one doubted her true gender. Although Fan Xian had once slept with Zhan Doudou, he only learned of this fact later. Zhan Doudou did not get together with Fan Xian. Instead, she married Si Lili and became the imperial concubine of Northern Qi.
During the Qing years, the Eldest Princess committed suicide. Because her affair with the Crown Prince was exposed, she was placed under house arrest and colluded with the Qin family and the Ye family to assassinate the Qing Emperor. However, the plot was eventually exposed, and the Eldest Princess, Crown Prince, and Second Prince all chose to commit suicide.
Dabao's ending in " Celebrating Years " was death. His true identity was the illegitimate son of the Qing Emperor and the Eldest Princess. He later became the leader of the ascetics in the Temple, Da Hongpao. Although Da Bao acted dumb on the surface, he was not really stupid. He was just a little stupid. He played an important role in the play and helped Fan Xian reveal the Qing Emperor's true colors. In the end, after Fan Xian killed the Qing Emperor, Dabao passed away while practicing ascetically in the Temple.