"The Orphan"s real name was not revealed. She does not seem to know her birthday, which she intended to find out.
She was a spy working for the Science Academy of Sauville. After having successfully stolen the Memento Box from Beelzebub's Skull, she; along with The Scarecrow, helped to assist Kazuya Kujo and Victorique de Blois onto the train leaving the then flooding Beelzebub Skull.
Her very last word was, "Mother."
"The Orphan" is a real orphan. Nothing was known about her except the fact that she does not know her own birthday.
- In Pixiv and various other sites for images and fanart, "The Orphan" is usually given the tag "L'Orpheline" which means "orphan" in French.