Originally a human girl (Annika Hansen), Seven of Nine was transformed into a semi-cybernetic entity when assimilated by the Borg during her childhood.
Seven’s humanity was restored when Commander Chakotay stimulated her human memories through a technologically augmented mind-link.
She joined the crew of the starship Voyager and, through trial and error, relearned how to interact appropriately with her fellow human beings and the other bipedal life forms that constitute the ship’s crew.
Seven is a fascinating symbol of something gone wrong, going right again. She adds a new twist to the fall and resurrection motif so common in mythic stories, old and new.