Kinana

Kinana is a waitress of the Fairy Tail guild and former partner of Cobra, a former member of the Dark guild, Oracion Seis. During her childhood, Kinana became a test subject when she was a prisoner in the Tower of Heaven when its cult members who worship the Dark Wizard Zeref, turned her into a large snake. After the cult fell, Cobra found her and named her Cubellios, forming a close bound. After the Oracion Seis were defeated, Makarov, the current guild master of Fairy Tail, used his magic to turn her back into a human. This resulted in her losing all her memories, but she would join Fairy Tail soon after.