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It is likely that the author uses the dialect to show someone who is an "outsider," that is, the author may have used the dialect to show a character who does not belong to the place where the story takes place and this affects the history by showing contrasts and diversity. This is because the dialect is the term that represents a different form of language and communication that people from different regions present.
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Asagai's main function as a character seems to be to inject the play with symbolism. Basically, Asagi is Africa. He represents one extreme of the American debate on assimilation. His presence in the play forces the audience (and Beneatha) to ask what it truly means to be an African American.