Merrill has a bully like personality where she intimidates the other Priestess in the library. She demands a high standard from Gwyneth to the point that she dose not want to displease her.
She is surprisingly young and stunningly beautiful. Nesta notes that Merrill's beauty makes Mor look drab in comparison. Merrill has white hair that is the same colour as fresh snow. Her skin is light brown and eyes the colour of a twilight sky.