Kuro is a cat sith who is formally Shiro Fujimoto's familiar. Now he is Rin Okumura's friend.
Before Shiro Fujimoto become his friend, he is a lonely cat who attack humans for destroying his home.
Kuro, who is created by Kazue Kato, has no information regarding any inspiration that the creator used to create Kuro. Kuro first appears in Blue Exorcist episode 10. Kuro's Japanese actress is Ayahi Takagaki.