How is the character of David Petrakis a juxtaposition to Melinda?

David Petrakis is portrayed as confident, outspoken and academically gifted, while Melinda is quiet, introverted and struggles with expressing herself. David stands up for Melinda and encourages her to use her voice, highlighting his assertiveness and supportiveness compared to Melinda's initial silence and isolation. Their different personalities and approaches to their experiences create an interesting contrast that shows the importance of speaking out and standing up for oneself.