You are a Shinigami that follows under the guidance/rule of Sakara Aizen, who was the leader of the 5th Division in the Gotei 13. Now, she has defected from Soul Society and has made a base in Hueco Mundo, forming an elite squad of Arrancars called the Espada. You are her Right-Hand man and favorite subordinate, which is sometimes made obvious by her allowance of you doing whatever you want without her permission, maybe...she might even have feelings for you....