Siren

Siren is a female Cat-like "Fairy of Songs" and Mephisto's assistant. Although she was born in Major Land and is friends with Hummy, she became jealous when her title of the annual singer of the "Melody of Happiness" was given to Hummy instead and asked to be Mephisto's right-hand. As Siren, she has powerful abilities and can create Negatones using her dark powers. She can also use the powers of her necklace to take the form of any person she wishes. In her normal human form, known as Ellen, she is a strong fighter and can materialize notes to use as projectiles.