Saya Otonashi is the central character in Blood+. She is a seemingly ordinary teenage girl adopted and living with amnesia. As her memories return, her life is turned upside down. She was born in 1833, survives on the blood of others, and is destined to destroy chiropterans and her twin sister Diva. Aiding her in her quest are her adopted brothers Kai and Riku and her ever-faithful chevalier Hagi. Her character as a fighter admired in many cosplay events. Cosplay Otonashi costume and cosplay Otonashi wig is well-liked in Blood+ cosplay.