Isadora is an old witch who is also a Watcher. Her duties include watching over the whole of Letum Wood and admitting girls to go to Miss Mabel's School for Girls. She has a twin sister, Sanna.
Isadora is an old woman with a hunched figure and pistachio-colored eyes, one of which is more blue than green. She has a habit to "zone out" at random times. She is quiet and calm, much unlike her sister.