Even though she has her fã servicey moments, the Demon King in Maoyu has taken it upon herself to change the world for the better for both human kind and demon kind.
Not quite sure of her name... I think its miku. From Black Rock Shooter!
posted over a year ago
I think your thinking of mato. Although, the character in that picture is actually named Black Rock shooter. Her design is similar to Miku Hatsune who is a vocaloid and sings the opening. Miku's not an animê character though.