Neerie is a water-elemental Guardian of Avalon. She is seen on the cover of Heart of Avalon. In the book, she talks with Emily and gifts her a new jewel, the Heart of Avalon.
She is seen at the very end of Full Circle, having devised a plan with the mages significant others to surprise them at Ravenswood for their last dance of middle school.
She was inspired by Lady of the Lake from Princess Gwenevere and the Jewel Riders.