Kuroka

Kuroka is a beautiful young woman with a voluptuous figure, long black hair with split bangs, and hazel-gold eyes with cat-like pupils. In her Nekomata form, which she is in all the time, she grows a pair of black cat ears and two black tails.

At first, Kuroka was shown to be rather malicious, with her aura described as being more "outright evil" when compared to the "vice" of Azazel's. In the past, she was said to have murdered her previous master, as she was unable to gain control over her Senjutsu, and was driven mad as a result. This initially seemed true, with her first appearance having her declare her intention to kill Rias, Issei, and her sister after the latter refused her, and that was after using poison to weaken Koneko and Rias, all after commenting on her intention to use Koneko as "a piece under my control".

However, she later claimed that vicious display was just her "going with the mood". Under normal circumstances, Kuroka is rather playful, nonchalant, and simple-minded, simply enjoying teasing people. She's rather vulgar, often using her beauty and sensuousness as a weapon among her arsenal of teasing others, most notably Issei. Fenrir once stated his belief that because of these traits she wastes her potential. Kuroka is also lustful and perverted as she enjoyed openly doing sexual things with Issei without restraint and is also proud of her sex appeal and breasts as she is offended when Bikou insulted her breasts. When Issei lost his perversion as a result of the Alphecca Tyrant, Kuroka was dismayed calling it a serious illness.

Above all else, despite her mischievous nature, she can be a kind and compassionate woman who loves Koneko more than anything, wanting peace more than anyone. To raise Koneko after becoming orphans, Kuroka agreed to become a reincarnated Devil. She murdered her former Master to protect her younger sister from him, though it meant she'd become labeled as a criminal and continued to play that part. However, Kuroka often has a hard time showing this side of herself, often opting to tease her younger sister instead.

She expressed an interest in having strong children, at first having propositioned Vali, but was rejected, then turning her attention to Issei, both of whom are the Heavenly Dragons' hosts. Her reason being that she wanted her species, the Nekoshou, to bloom once again, their kind being inherently rare. Before and after moving into the Hyoudou Residence, Kuroka is often described as a freeloader. Most of the time, she's seen playing video games and being a glutton, never assisting around the house and instead leaving that work to the others, unlike Le Fay. After being called out on this fact, Kuroka often offered Issei sex as a means of getting out of it. Like her sister Koneko, Kuroka is also shown to have a big appetite, as she would eat other people's snacks without asking and accompanied the Gremory group on their fishing trip solely to eat the fish they caught, claiming all the nutrients go to her breasts.

Adding to her feline personality, Kuroka often ends her sentences with "Nya" (にゃ), mimicking a cat's meow.