Dead Master  

, デッドマスター

The character you are referring to goes by the name Dead Master and has black hair styled into straight bangs. Her eyes are neon green in color, and she wears a Gothic lolita costume consisting of a black dress that reaches down to her thighs, accented with a white ribbon around her waist. She also wears leggings, black pumps, black gauntlets on each hand, and long horns resembling vertebrae on her head. Additionally, she has a pair of wings that sit low on her back. Dead Master fights alongside Dead Scythe and can use chains as a weapon. In another world, she is the "other self" of Yomi Takanashi.