A Yin, the son of Hou Chi and Bai Jue, is the inheritor of Chaos power and the third formal disciple of Emperor Donghua. His connection with A Yin was destined from the moment he inadvertently disrupted the Phoenix's Nirvana. In the novel, when A Yin is on the verge of danger, he not only nourishes her with his own blood but also exhausts all means to obtain rare and exotic herbs to extend her life.

Due to his efforts to save A Yin, he missed the opportunity to protect Da Ze Mountain, leading to his own ascension as a god through the consumption of vital energy. While he is investigating the murderer, A Yin violates heavenly rules to save Hong Yi, resulting in her demise under the Nine Heavens Profound Thunder that he had summoned. His only option is to patiently wait for A Yin's return for thousands of years.

Hong Yi, also known as the Peacock Princess of Hundred Bird Island, is the most esteemed avian noble beneath the Phoenix race, and the most beautiful being in the Four Seas and Eight Wildernesses. She is also the first love of Gu Jin from Da Ze Mountain. In terms of appearance, she was once overshadowed by Princess Jing Zhao, the daughter of the former Emperor, and in terms of status, she must submit to the Fire Phoenix clan. This led to her harboring ambitions and attempting to surpass the position of the Phoenix clan, resorting to any means necessary, even collaborating with the demon tribe. In front of her, A Yin not only endures mistreatment but would have been killed by her if not for the protection of Emperor Donghua's Lotus.

Lan Feng is both Xiu Yan and Ao Ge, and he is also the ruler of the cycle of reincarnation in the Three Realms as the King of You Luo. Although they are portrayed as two individuals in the novel, they can also be seen as one because they share a single body as twin brothers with shared souls.

In the novel, Ao Ge willingly gave up his divine status and the position of Heavenly Emperor to protect Xiu Yan, taking his place in the Ghost Realm and becoming its new ruler. He even used his body as a vessel to help Xiu Yan awaken and be reborn. As a result, Ao Ge, who possesses Xiu Yan's soul, must remain in the Ghost Realm and can never leave again.

Hong Ruo, also known as Feng Ran, is Feng Yin's master and Hou Chi's pet and best friend. She is the current clan leader of the Fire Phoenix tribe on Wu Tong Island and the reigning Heavenly Emperor. Her true form is that of the first divine phoenix born without a father or mother in the Three Realms. She loved and then resented Jing Jian, the son of the former Emperor, and used half of her divine power to reunite his soul. Later, she used another half of her divine power to seal the Nine Abyss Hell in Zi Yue Mountain.

In the novel, without her divine power, she assumed the role of managing the heavenly realm for a thousand years, awaiting Feng Yin's return from Nirvana.

Yan Shuang, also known as Qing Li, is the mastermind behind all the conspiracies in the novel. Her love triangle with Lin Mo and Hong Ruo can be explored in the work "Qian Gu Jue Chen." The conclusion of their story in "The Last Immortal" is a tragic one.

In the novel, Qing Li gains immense power from the demon tribe, bestowed upon her by the true Grand Elder of the Demon Realm, Xuan Yi.