Sophie is the hardworking and reliable student council vice-president. She is friendly and energetic toward her friends, but she can be stern and cold toward people she is uncomfortable around.

She can be very strict when it comes to her grades as well as the grades of her friends, often scolding Ethan and Valerie when they don’t get their work done in a timely fashion. She's very curious and is always rambling on about her latest discovery. She has a soft spot for frogs and reptiles, and keeps several as pets.
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She becomes a magical girl on her 17th birthday in order to protect her friends from the Nightmare Agent Opal. She transforms into the Crystal Warrior of intelligence and clarity, Sapphire Heart and her element is ice.