Mio Naruse

Mio Naruse is the daughter of the previous Demon Lord, Wilbert and a human named Ashe thus making her a humanoid demon, as well as the niece of Sapphire. After the "death" of her father, Mio inherited his power and was raised in the Human World as the daughter of two unnamed demons as a human. Though after the death of her adoptive parents, she was later saved by Maria who revealed the truth about her lineage. Both later came up with the ruse where their "mother" would be marrying Jin Toujou and become the stepsisters of Basara Toujou in an attempt to make their house their base, while father and son would have their memories altered and move elsewhere. However, this plan failed after both of them were revealed to be banished members of the Hero Clan, but Mio and Maria continue to live in the Toujou Household. Mio is shown to be a calm and quiet person, especially around those she isn't close to, but she's rather talkative around her closest friends such as Chika and Shiho. It is noted that she can be rather quick to anger based on the situation, mostly if someone close to her is threatened, insulted or harmed, first shown when she slapped Takashi who didn't understand it was Basara who was suffering more than anyone after the incident from six years prior. Mio can also become enraged if she believes someone important to her has been killed to the point of wanting to eliminate the person responsible herself. Despite being referred to as a dangerous threat by the Hero Clan, Mio is rather caring, honest and compassionate. She hates lying for the most part to those who have helped her, as shown when she and Maria lied to Basara and Jin about their marriage to use their home as a base, even choosing to erase their memories so they wouldn't get involved in their problems anymore. Although Mio attempts to act brave and calm all the most, deep down she is afraid about her current situation since she has lived most of her life as a normal high school girl.