Hilda Spellman

Hildegard "Hilda" Antoinette Spellman is one of Sabrina’s two witch aunts. More nurturing than
 Zelda, Hilda’s motherly nature and warm sense of humor belie a wicked, ghoulish streak. She is as adept at brewing spite jars against her family’s enemies as she is at concocting love potions for the students at Baxter High.''
When Hilda turned sixteen, she signed her name in the Book of the Beast, and joined the Academy of Unseen Arts. However, her academic years at the Academy were unpleasant, for her older sister, Zelda, caused her to undergo a series of hazing rituals called the Harrowing.
Hilda is a sweet, kind, and maternal witch, more empathic to the clients of the Spellman Mortuary than Zelda, and definitely the more benevolent of the two sisters. She is also much more affectionate and understanding towards Sabrina than Zelda. A notable feature of her would be her often peppering her daily conversation with others with sweet and affectionate nicknames, such as "love", or "darling", or "lamb" as just a few examples.
However, despite her openly sweet exterior, Hilda can be very vengeful when she wants to be, and one of her greatest desires was revenge for the abuse Zelda inflicted upon her during their childhood. Also, as revealed by a demon-induced nightmare, Hilda's greatest desire was to be independent from her older sister and find true love, and her greatest fear was to be literally stuck with Zelda forever. One particularly notable difference would be that, unlike Zelda, Hilda can be a real rebel - she does not completely agree with the ways of the Church of Night, and has absolutely no qualms about defying or even openly challenging it where her family or her own principles were concerned.
At some point, Hilda moved to England to take care of her nephew, Ambrose, and it was during that time that she acquired her British accent. After her niece's birth, she accompanied her sister-in-law, Diana Spellman, to Sabrina's baptism at the Holy Mother Church of Greendale, keeping the secret from her brother and sister. While living with her sister, she was sometimes killed by Zelda for various reasons, and Zelda would put her body in the Cain Pit in their family plot, where she would be resurrected. Her nephew Ambrose was arrested for conspiring to blow up the Vatican and placed under house arrest in Hilda and Zelda's residence. After Edward and Diana died, Hilda and Zelda became Sabrina's guardians and raised her.