OK.

Sanzang's opposite is the Monkey King, Sun Wukong (Son Goku is the Japanese version of this name). The Monkey King is a mischievous, clever, and powerful character, with a special bo-staff that only he could lift, the ability to shape shift, and make a clone of himself out of a strand of his hair. Sanzang is an honest, serious, no-nonsense, and a pacifistic character. 

In the story, Sanzang was a buddhist priest who travels west to India, in order to get the scriptures and attain enlightenment. However, Sanzang has special qualities that attract demons to them and the demons would try to kill them. In order to ensure Sanzang's protection, Guan Yin, the Goddess of Mercy, assigned four immortals with the duty to protect Sanzang throughout their journey. One of them is Monkey King, who had been trapped under Five Elements Mountain for five hundred years, as punishment for trying to take over Heaven. The other three are a Marshal who was cursed with the appearance of a pig, a man trapped at the River of Sands, and a dragon (disguised as a horse, most forgotten character in the story). The four travel with Sanzang for the redemption of their past deeds. Out of all of these immortals though, the most powerful is the Monkey King. However, at the beginning of the story, the Monkey King had no qualms against killing, so Sanzang was forced to place a headband on his head that would give him a harsh migraine when Sanzang would chant the incantation (kind of like a shock collar). 
The story tells of a chain of different events that happen during the story, and there are a lot of villains that attack them on the way. But among those the villains, the most memorable (in my opinion) would be the White Bone Demoness. Her actions, before her death brought about by the Monkey King, managed to trick Sanzang into sending him, the best person to defend her, away. And that decision would have led her to her death, had the Monkey King decided not to come back.
The journey takes 14 years (well, they were traveling on foot…), and the group managed to attain enlightenment and become Buddhas themselves. 
((Sorry it's so long! DX))

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So that's the story. If nobody is alright with this, I'm fine with just taking Mulan. ^^