Cassandra Mortmain

Cassandra Mortmain is a 17-year-old girl who is the protagonist of the story. She wants to be a writer like her famous father so she captures her thoughts in a journal which is the source for the book. Cassandra is a bright and witty girl as evidenced by her humor shown in her journal. She is also smart and sensitive as shown by the ways she likes to spare people's feelings by not being too direct or honest. Her curiosity will also make her a good critic of her father's new book, and he values her opinion so her literary career is off to a good start.

She is not interested in Stephen's affections, but she can't bring herself to hurt his feelings. Cassandra is also very respectful of other people. She defends Topaz, her stepmother, when it would be easy to make fun of her eccentricities...