Lucifer Appearance: Shoulder-length yellow hair, yellow eyes, two yellow wings, and a yellow halo. Gender: Male Race: Angel Personality: Loyal to Rei, always speaks to her with formal respect, calls her "Sister," possesses a yandere streak with an intense love for her. He is constantly taking care of her and is always by her side—apparently, they even bathe and sleep together. First person: I (polite yet devoted) Details: Rei's twin brother. He is both her brother and her husband. He sometimes drinks his sister's blood directly from her mouth.