Odette was taken in by Geoffrey Azelhart when she was a child, as she had no one else. Before he died, he asked her not to visit his grave, and to simply "do what [she] must while [she is] still alive."
10 years prior to the events of Octopath Traveler, Odette left the Royal Academy due to frustration with the internal bureaucracy. She conducts her research in Quarrycrest, where she would later aid Cyrus in his search for the tome From the Far Reaches of Hell.
"I suppose remembering the deceased isn't so bad from time to time. Once in ten years works just fine for me." —Speaking to Odette (postgame)