Zelda Spellman

Zelda Phiona Spellman is Sabrina’s sterner witch aunt the other being Hilda. Proud and devout, Zelda believes there is no greater honor than serving the Dark Lord as a member of the Church of Night. She is the family’s disciplinarian, fiercely protective of Sabrina, and very much Cain to Hilda’s Abel.
When she was sixteen, Zelda signed the Book of the Beast, pledging her allegiance to the Dark Lord and joined the Academy of Unseen Arts, where she was put through the Harrowing. When Hilda went to Academy, Zelda submitted her also to the school's Harrowing, a 
form of hazing for new witches, making academic life difficult for her little sister.
Due to her love for babies, she along with Hilda, became midwives. Zelda delivered many babies into the Church of Night and was considered the finest midwife their coven has ever seen, and she often reveled in the sin of pride because of it.
When Sabrina was three days old, Zelda acted as a witness for her brother, Edward, in signing Sabrina's name to the Book of the Beast, promising Sabrina to the Dark Lord's service.
At some point, Zelda's nephew Ambrose was arrested for a conspiracy to blow up the Vatican, and when he refused to give up his co-conspirators, he was sentenced to house arrest under the watch of Hilda and Zelda. After Edward and Diana Spellman died, Zelda and her sister became Sabrina's guardians and raised her.
Zelda is a glamorous, stern, proud, and sometimes haughty, but still softhearted witch, devout to the Church of Night. She follows the rules of the Church but is also willing to break them, to protect her family. Although she often abuses and kills Hilda, Zelda genuinely loves and cares about her; one of her greatest fears is losing her forever.
One of her most defining traits is her maternal soul. Zelda cares deeply for children. She considers Sabrina a daughter and would kill anyone who tried to take Ambrose from her.