Hello Kitty is one of the most beloved and iconic characters in the world. She is known for her sweet and innocent appearance, as well as her positive and caring personality. However, there is a darker side to Hello Kitty that is often overlooked: her devilish alter ego, Hello Kitty Devil. Hello Kitty Devil was first introduced in 2004 as a part of the Sanrio Halloween line. A fanart Sanrio Hello Kitty Devil Sticker.