My BB/Kuro OC, Ruby Dalles-Burnett, the daughter of Baron Burnett and Dr. Angelina Dalles, also known as Madame Red.
As you can see, she takes after her mother, with her bright red hair. Her father died before she was born but her mother talks about him fondly; about how they met, his proposal, and how happy they were. She wants to become a doctor like her mother.
She is close with her cousins, Ciel Phantomhive and Edward and Elizabeth "Lizzie" Midford. After the death of her mother, she inherited her father's title and estate, but she choose to leave it in the care of her aunt and uncle, Francis and Alexis Midford, as she choose to study abroad. She keeps in touch with her family through letters and packages.
When she does return, she goes to work at the Royal London Hospital, where her mother worked at. She helps Ciel by keeping tabs on the doctors and reporting about any illicit affairs that are happening to the Aristocrats of Evil.
When she first meets Grell, she can tell something is off about him, and notices small changes in her mother's behavior. She doesn't know that her mother is one half of Jack the Ripper, but learns later on by accident.
Unlike other people, Ruby can see Grim Reapers because she nearly died before she was even born. William notes that it is unusual for humans to be able to see Reapers, even after escaping death.
She met and later falls in love with Edgar Redmond before the Public School Arc at a party hosted by his uncle, Viscount Aleister Chamber. They talked and while they have little in common, they find each others company relaxing and are naturally drawn to one another.
After the events of the School Arc, she tries to reason with him to no avail, as he and other P4 have been completely taken in by the Blue Cult. Afterwards, she slaps some sense into him and takes him and the other P4 into her home despite her aunt and uncle's warnings not to.