Vivaldi is based upon The Queen of Hearts. Like the character in Carroll's book, she regularly orders the beheading of servants for the smallest of mishaps. She tends to use the majestic plural and is demanding and dangerous. A beautiful and composed woman who shows little emotion, she does expose her feelings towards Blood when Peter and Ace inform her of his interest and advances to Alice. She loves cute things and has a secret room full of stuffed animals. Only a few select maids know of her collection. Vivaldi is secretly Blood's older sister and as the Queen of Hearts, she is the only person aside from Alice who is able to keep Peter in line.