Toge Inumaki is important too. His special cursed speech ability makes him stand out. Also, the principal of the school, Masamichi Yaga, is likely to be important as he is in a position of authority and has an influence on Gojo and the other students. There could be other characters like the members of different clans that also play roles in the complex web of the story.
If the prince died, it would be the second chapter of Sword Snow Stride "," Sighing that the sword of the Lingjiang River can break a thousand armor, laughing at the cold blade hanging on Guangling."
Shi Ying died in the 35th episode of Yugu Yao. In this episode, Shi Ying killed Zhi Yuan, and Zhu Yan was in great pain. Shi Ying willfully pierced himself with Zhu Yan's sword, and he died under Zhu Yan's sword. This scene happened at the end of the movie, marking Shi Ying's death.