Rachel is very artistic, witty, and kind. She enjoys volunteering for charity events to help schools in the area to keep their art programs open. She is also very open-minded, being able to accept that Percy is a demigod and that monsters do exist.

Rachel can be very blunt at times and has a habit of talking a mile a minute, which Percy described as "punching him with words." She is very brave, throwing a hairbrush in the face of Kronos' host to escape. Like her parents, Rachel can be stubborn.