Ana Kosara was originally an Ekaterina, but she later joined the Madrigals after passing the Madrigal test with flying colors. Because of many things that happened during the time she was a Madrigal, she became a Vesper. She only joined the Madrigals so she could spy on them and to give an advantage to the Vespers. She has a relative named Teodora Kosara, who is also a Vesper.