Zero's younger identical twin brother, Ichiru failed to become a Vampire Hunter due to his weak body and lack of hunter talents. He was believed to have been killed by the pure-blood vampire, Hio Shizuka, but he returned to Zero’s side 4 years later, revealing that he had willingly become Shizuka’s servant. She had given him her blood to cure his chronic illness in exchange for his loyalty, but she did not turn him into a vampire.
Amore’s twin, Artemisia makes a great Ichiru, much like how Amore makes an awesome Zero. Twins cosplaying twins; can’t go wrong there! Thanks again for allowing me to post this!