Aya Tokoyogi is the main antagonist in Fiesta For the Observers Arc on the Japanese animated anime series Strike the Blood. As well is one of the main antagonists in Light Novel. She is one of the main antagonists of the entire series, the most recognized and cruel due to her role in the anime Arc 3 as the main antagonist, she is one of the most evil and cruel in Strike the Blood; while most of the other major villains in the series are witches or monsters who commit crimes just for money or power, Aya is one of the only characters who commits atrocities family and commits all her atrocities and crimes without reason, as sink a island with 500.000 people without reasons. Until the end of the arch of her crimes were not justified.