She's not always a benevolent soul,
and she is very unpredictable.
Mother Nature is a powerful, but mysterious, being, as well the daughter of the Nightmare King, Pitch.
There is an ongoing debate among the fans as to what Mother Nature's real name is. It was once believed that William Joyce revealed her name to be Seraphina in an interview, but this has never been confirmed by an actual source, and is thus highly improbable.