Carol is a Tangent who inhabits a teenage body.
In The Rule of Thoughts, a teenage girl stares at Michael from the windows of a coffee shop when Michael, Bryson and Sarah were near the VNS headquarters in Atlanta. Afterwards, she follows them, still staring at Michael. She introduces herself as "Carol" and explains that she just wants to greet the "First" and that Kaine showed Michael to them, referring to him as the First. She told him to remember her name, for she was sure they would see each other again, and that the world was changing thanks to Kaine and Michael.
She is described as an odd-looking teenage girl, with long blond hair framing her strange, elven face with dark eyes.