Final answer:
Oona's recount of her father's bravery sets a standard for the courage she expects from a suitor, thereby deepening her characterization and revealing her personal values.
Step-by-step explanation:
In the context of the question, it is implied that Oona, while discussing her father's bravery, is also establishing a standard of courage and honor that she expects from a potential husband. The details of her father's bravery are not only used to show Oona's pride in her heritage but also serve as a benchmark for assessing the character of her suitor. By asserting that she cannot be the wife of a coward, she communicates that the courage and values exemplified by her father are crucial to her own identity and thereby to her choice of a life partner. This narrative function can deepen the characterization of Oona and provide insight into her personal values and motivations.