Many fantasy settings include deities of some sort, who may or may not directly assist/hinder/communicate with the characters. Authors may choose to use established gods and goddesses from mythology, create their own religion(s), or combine the two. Below are some resources they can use to more fully develop deities and religion in their books.
Frigg (Norse goddess, wife of Oden)
Fenir (Norse wolf)
Thor (Norse God)
African Mythology (Infographic on Deities)