Here are some key facts about Cissy:
* Family: She was born into the Black family, a notoriously pure-blood wizarding family.
* Marriage: She married Cygnus Black, her cousin, and they had three daughters: Bellatrix, Narcisa, and Andromeda.
* Loyalty: Cissy remained loyal to Lord Voldemort throughout his reign of terror. She was a Death Eater and even supported her daughter Bellatrix's actions.
* Personality: Cissy was often described as being cold and haughty, similar to her family. She was also fiercely proud of her lineage and embraced the idea of pure-blood wizarding supremacy.
* Relationship with her daughters: She favored Bellatrix over Narcisa and Andromeda. She was deeply disappointed in Andromeda for marrying a Muggle-born wizard, and Narcisa for not being as fierce and dedicated to the cause of pure-blood dominance.
* Role in the series: Although not a major character, Cissy played a role in events leading up to Harry Potter's birth, and her actions had a significant impact on the story. For example, she played a part in the prophecy about Harry's birth, which ultimately led to his parents' deaths.
While not a major character, Cissy is a crucial figure in the Harry Potter universe. She embodies the ideals of the Black family and plays a role in shaping the lives of her daughters, who ultimately went on to be powerful figures in Voldemort's regime.