The evil Irish Nun
The unnamed Irish Nun (Gilda Waugh) was a villainess from the 2018 horror film, The Bad Nun (alternately titled, The Watcher). She was a nun serving at a convent decades prior to the film's events.
As revealed in the film's progression, the unnamed nun was also a villainess and pedophile, as she habitually molested her young charges. One victim was young Dan, who grew up to become a serial killer due to the trauma he suffered due to being abused. The film featured old videos of the evil nun caressing young Dan's face and seducing him as part of her abuse. The villainess was charged with her various sex crimes, but the case was thrown out due to lack of evidence.
Years later, Dan tracked down his former nun's home and entered, shocking the villainess, who quickly recognized Dan. The nun ordered Dan to stop videotaping her and to leave her house, while claiming to be apologetic over what she did to her, but saying that her actions were done years ago. Dan responded by brutally killing his abusive nun.