Fidanzata is an animal handler and can control between 0 and 3 rat swarms who will fight for her. She is a mercenary and can be hired by any crew except the Imperial Armada.
New Freebooter previews
Freebooter Miniatures have posted photos of the greens for two new Freeboooter's Fate figures - the Rat Swarm and Fidanzata. From their website: