You forgot to mention that these questions are about the "American Born Chinese" comic.
Answer and Explanation:
1. The author includes the parts about the monkey king to extend the meaning of being who he is, no matter what the person has, or the status he carries, just like the monkey king, nothing will change the perception of others about you , you won't even be able to change what it is.
2. This concept is related to Jin-Wang and Danny, because it shows that even though they were born in America, their ethnicity is not American. For this reason, they will never be seen as American citizens, they will never be treated as an America, because people can only see their ethnicity and will always treat you based on ethnicity and not nationality.
3. I believe that the inclusion of the monkey king story is important for the plot because it shows us a reality about Americans of Chinese descent, or ancestry in another ethnicity, who try to fit in and be part of the culture of their native country, the USA , but they are always deprived of it, because they are not considered part of the nation, no matter what they have or what they seem, just like the monkey king, that even though he is a king, even though he is a deity, he will never be seen as anything more than a monkey.