Kaya Syokka codename Gypsy Queen, is the youngest AX agent. She only appears in the novels.
She is first mentioned by Abel Nightroad as the leader of the investigation in Barcelona. After the death of Noélle Bor, Kaya was placed in charge of recovering both the body and the data that she was able to obtain prior to the destruction of the city. Sister Kaya fights using fans, and aided Father Wordsworth in killing Kaspar von Neumann by burning her to death.