CVRIE (short for "Contagions Vulnerability Robotic Infirmary Engineer", dubbed Curie by Dr. Kenneth Collins) is a companion (as a modified Miss Nanny model)

--Background--

Curie began as a Miss Nanny robot intended for use in the secret partition of Vault 81 as a lab assistant. Only a handful of the vault's scientific staff were working in the vault when the Great War hit, which led Dr. Kenneth Collins to modify the robot and give it greater operational freedom so that it could conduct its own experiments.

Dr. Collins programmed a custom feminine personality derived from history's famed intellectuals such as Marie Skłodowska Curie, Immanuel Kant, and Albert Einstein, added a French-accented voice (based on a woman Collins had a relationship with while studying in Paris in the 2040's), and christened his creation "Curie", an acronym based on the robot's original designation (CVRIE). As Curie began taking on greater responsibilities, Dr. Collins insisted that the other scientists treat her as they would a human, and even set aside a terminal for her personal use, an act of kindness that initially bewildered Curie, but which she later came to appreciate. Through her work and interaction with the scientists, Curie gradually developed a degree of self-awareness and independence that surprised even Dr. Collins.

When the scientists eventually succumbed to old age, Curie curated their remains, storing the bodies of two in empty lockers and cremating the third according to his wishes. For decades, Curie took on their research alone and in 2204 completed Vault 81's original initiative: she perfected a panacea capable of curing every disease that afflicted humanity. Unfortunately, she was still beholden to her programming and was incapable of leaving the secret partition without express authorization from a Vault-Tec employee. For 83 years, she waited idly for Vault-Tec security to arrive, watching the escaped mole rats that had been used as test subjects run free.

When Curie was finally discovered by the Sole Survivor in 2287, she elatedly handed over the last remaining unexpired dose of the cure and decided to travel with the Survivor in order to seek out new research opportunities in the Commonwealth.