Just like all other vampires (minus Mikaela), she views the humans as nothing more than livestock. She sees them as foul and endlessly greedy creatures who will do anything for their own personal gain. When Ferid Bathory slaughters the Hyakuya Sect orphans, she carefully hid in Sanguinem and protected as livestock, she becomes enraged because he fatally wounded one of the seraph and allowed another to escape. She never mentions a word about the orphans and displays no interest in them. She saves Mika's life against his will by turning him into a vampire, but this appears to have been done for her own personal interests. He refuses to drink human blood, so she gives her blood to him in exchange for making him dependent on her. Even so, she is the only vampire who shows him kindness, and there are several moments when she hugs him or treats him gently. After developing a close bond with Mika, she shows concern for his family member, Yūichirō Hyakuya. She claims to like both Mika and Yū. However, it is uncertain if this is because she is close with Mika and is concerned for Mika's sake or if this is because she wants to use the seraph for her own purposes. She also appears to trust Mika, and only her and Mika appear to know Krul's true goals.
Vampire hug
Krul hugs Mika.
Krul keeps many secrets, including what she knows of the "seraph of the end," and she is deceitful toward the Progenitor Council about her criminal activities.
Like most vampires, she is proud. As a third progenitor and the queen of Japan, she has reason to be and the power to back it up. When Third Progenitor Lest Karr challenges her position as the ruler of Japan, she becomes angry and claims she never fails, ever. She is temperamental when challenged and does not hesitate to remind her challenger of his/her place. However, Ferid Bathory blackmails her to keep her temper in check and to prevent her from killing him where he stands.
She is the only character in this series shown so far who appears to enjoy being bitten.