Diva (Blood+)

Real sister Saya and the greatest enemy of Red Shield. Joel imprisoned by the first right after her birth, she spent the first decades of his life locked in a tower on the edge of the field. As it was just a guinea pig for Joel, she had no name until she is found by Saya, who called Diva because of her voice. It turns out that this is Diva killed Joel the first at the end of the nineteenth century, after she cheated Saya for the release of his captivity. Substance "Delta 67", used in research involving bats, is obtained from blood. Some of his faithful knights are among the leaders of the Group of Five Arrows. The blood of Saya is a threat to her and her servants, her blood can also destroy Saya and his knights. His childish behavior (like a spoiled child and naive) is probably the result of his childhood as a recluse. We later learned that Diva raped Riku in episode 32 to get pregnant. She gave birth a few episodes later and we see the cocoons (rather than newborns) in episode 46. She died, killed by the blood of his sister in episode 49.