What can a writer describe about two characters to develop their personalities

The communication, usually done through dialogue, between the characters helps to build each other's personalities, feelings, beliefs, ideologies, and particularities, which set them apart from the rest of the characters.  

A well-written dialogue can reveal subtleties, personality, and the nuances of characters without the need of description or exposition.

the addition that would strengthen melissa’s thesis statement, both the dark game and the code book explain the importance of codebreaking, is :

main ideas of each book

melissa should discuss the main ideas of each book because these ideas will fully support her thesis statement. through these details, readers will also understand the importance of codebreaking that melissa referred to, which was inspired by the books.

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explanation: