After found by Caro and Erio during their break, she was taken into Nanoha and Fate’s care. Her most visible feature is heterochromia. Quattro has referred to her as the “Vessel of the Saints.”
After Vivio was adopted by Nanoha, her name was officially changed to Takamachi Vivio.
Vivio has Nanoha as her mother and Fate as her step-mother who is really her Godmother.