Yoruka Kirihime

Yoruka Kirihime is one of the female protagonists of Saijaku Muhai no Bahamut. She was the princess of the fallen nation of Koto, later becoming an assassin for the Old Arcadia Empire and finally becoming a student of the New Kingdom's Royal Officer Academy after Hayes' manipulation of her. At the end of the series, she married Lux Arcadia and became one of the five queens of the New Kingdom. Yoruka is a slim girl with waist-length black hair and her most interesting trait is her heterochromatic eyes: her right eye is blue and her left eye is purple. She wears a black yukata which is tied by a red obi around her waist. Yoruka is a cute ruthless assassin when it's necessary who also has the sharpest instinct and hunch among the girls that love Lux. When she is serving her "master", she is kind yet still has an evil air to her but is super cute and truly love Lux and is ready to die for him. Yoruka isn't introverted but she initially had trouble adapting to an ordinary life. She snuck away from class to guard Lux Arcadia, didn't try to work with others during training, ignored regulations on when to sleep or wake up, carried hidden weapons and didn't change her ways when scolded. She starts to change after a talk with Lux. Her emotion was only shown toward Lux and her killed brother.