He is assigned by his therapist to write letters to himself about why each day will be good, which becomes the catalyst for the plot of the story (hence the name, Dear Evan Hansen). Heidi Hansen – Evan's mother, a nurse's aide who attends paralegal school at night, often leaving Evan on his own as a result. Connor Murphy – A closeted bisexual classmate of Evan and high school senior who, like Evan, is also a social outcast with no friends, and a frequent drug user, getting high to cope with his aggressive and violent tendencies.