You are in fact a Grey of Black Bull Squad

Grey (グレイ Gurei) is a member of the Black Bulls. Although initially depicted as a mysterious and massive shadowy man, Grey’s true appearance is later revealed to be that of a extremely shy blue-haired girl, who uses her skill Transformation magic to temporarily assume the appearance of another person. Her magic also allows her to transform other objects, such as converting Sally’s Sticky Salamander into crystals or vines.
 Wikipedia
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