Kamio Misuzu
Kamio Misuzu is the protagonist in Air. As a reincarnation of pterosaur memory, he needs to constantly recall the genetic memory of pterosaurs in past dynasties, and the human body can't bear such a huge memory. At this time, the arrival of the protagonist Kunisaki Yukito not only adds color to Kamio Misuzu's life, but also sacrifices the brain capacity for Kamio Misuzu and prolongs Kamio Misuzu's life by virtue of the Millennium belief of carrying dolls with him. I thought Kamio Misuzu could spend the rest of his life happily, but unfortunately, he finally passed away.
Miyazono Kaori
Miyazono Kaori is the heroine in April Is Your Lie. She started out as a friend of the protagonist Arima Kousei. In fact, she always liked Gong Sheng and admired Gong Sheng since she was a child, hoping to be his accompanist, but she was afraid to talk to him, and was later told that she was terminally ill. Miyazono Kaori began to let go of her troubles, broke into Arima Kousei's life and helped Gong Sheng get rid of her mother's shadow. However, when Gong Sheng got out of the predicament, Miyazono Kaori was bedridden and finally died. I thought it was possible to join hands with the world music scene, but all his illusions were shattered with Miyazono Kaori, which made people feel unacceptable.
Jiraiya
Jiraiya is an important character in Naruto. He once accepted the trio of Changben, Xiaonan and Yahiko, as well as Namikaze Minato and Naruto Uzumaki as disciples. No matter the trio of Nagato, Xiaonan and Yahiko, or the father and son of Namikaze Minato and Naruto, they all played a very important role in the plot, and eventually they all became movie-level powerhouses. Although he is usually lewd and immoral, he actually works carefully and delicately. Whether it's Imam, peony, Yahiko, Namikaze Minato, Naruto, he goes all out. He not only taught Naruto a lot of endurance, but also taught him a lot of philosophy of life, which made Naruto move from naivety to maturity.
Kamina
Kamina is an important character in tianyuan breakthrough, the first generation leader of the Red Lotus League, and the eldest brother of Simon's faith. She has been inspiring Simon with her actions, and she was injured in the battle with Zimiruf of Wang Zhiyi, the fourth king of the Orc Spiral, and then died unfortunately. After that, Kamina's never-say-die spirit has been inspiring the whole red-violet group and Simon, and finally successfully defeated the anti-spiral group. Kamina's death certainly made Simon and Honglian Group grow rapidly.
The above is just a personal opinion.