Who is Father Dominic from Haunted: A Tale of the Mediator and what is their importance?

Father Dominic is the priest and principal of Susannah's school. Father Dominic is a mediator also, so he shares Susannah's ability to see and talk with ghosts. Father Dominic acts as a mentor to Susannah. Throughout the novel, Father Dominic tries to teach Susannah how to take a softer and more sensitive approach in helping ghosts to pass over to the other side.