What is the purpose of the characters created by The Journey to the West and the character analysis of the four protagonists?

The Monkey King, also known as Monkey King and Monkey King. It is a stone monkey cultivated by the Lingshi of Huaguoshan, Ole Dongsheng, Shenzhou. It occupied Guo Huashan for three or five hundred years. After eight or nine years, I learned seventy-two changes in Fangcun Mountain, Lingtai, Hezhou and Niu after wading through mountains and rivers and worshiping Bodhi as my teacher. Since then, the Monkey King made a scene in the Heavenly Palace, claiming to be the Great Sage of Monkey, and was suppressed by the Tathagata at the foot of the Five Elements Mountain, unable to move. Five hundred years later, the Tang Priest went to the Western Heaven to learn Buddhist scriptures, passed by Wuxing Mountain, and broke the spell before he saved the Monkey King. The Monkey King was so grateful that, at the instigation of Guanyin Bodhisattva, he worshipped the Tang Priest as a teacher and went to the Western Heaven to learn Buddhist scriptures. On the way to learn from the scriptures, the Monkey King exorcised demons and made many remarkable achievements. However, he was misunderstood and expelled again and again by Tang Priest and his disciples. Finally, the four of them arrived at the Buddhist Leiyin Temple and got the true scriptures. The Monkey King's cultivation was successful, and the seal fight defeated the Buddha. The Monkey King is smart, lively, brave, loyal and fierce, which has become the embodiment of wisdom and courage in China culture. In a little boy's China, the Monkey King could easily become his idol.

Tang Priest, the Tang Priest in the novel is a fictional character, which is different from the real character Master Xuanzang in history. The Tang Priest in the novel, commonly known as Chen and posthumous title, was named Xuanzang. He is a posthumous child. He became a monk and grew up in a temple. Due to the tragic and bizarre experiences of his parents, he finally moved to a famous temple in Beijing to settle down and practice. Tang Priest is studious and highly savvy, and stands out among the monks in the temple. Finally, he was selected by the emperor of the Tang Dynasty and went to the Western Heaven to learn from the scriptures. On the way to learn Buddhist scriptures, the Tang Priest successively surrendered three disciples, the Monkey King, Pig Bajie and Friar Sand. Master Xuanzang, named Sanzang, has a common surname of Chen. It turns out that the golden cicada was reincarnated before the Buddha. Becoming a monk in biochemical temple.

Pig Bajie was once a marshal of the Tiangong canopy. He came down to earth because of teasing Chang 'e, but he mistakenly threw a pig fetus and grew into a pig face. Catch the people of Gaolaozhuang. Pig's weapon is nine-tooth nail palladium. Pigs can only change 36.

Friar Sand used to be the general who closed the temple. Because he broke the glass lamp at the flat peach party, he angered the queen mother, was banished to the world, was turned into a monster by Liushahe, and was later subdued by Tang Priest and his disciples.