Demon 5’7. He has spiky medium length jet-black hair. Yu's eyes become scarlet and he sprouts two black horns from his head, His teeth become pointed while curse marks appear on the side of his face. On the surface, Yu is a fierce, hot blooded, impulsive and strong-willed with a kind heart. He is also has a combination of fearlessness and recklessness in the face of battle, and sometimes has a habit of not following orders when following his own convictions. He wielded a standard demon katana until he was promoted into the Moon Demon Company. As a private of the Demon Army, Yu wears the conventional JIDA uniform which consists of a long-sleeved black coat with light green details including the shoulder epaulettes. These have a brown Sam Browne belt passing diagonally over his right shoulder and two rows of gold buttons on the front. Along with that, he wears a pair of white gloves and a white web belt with a gold waist-plate. HE IS TRYING TO KILL VAMPIRES.

Being a vampire, and one being turned by the third progenitor, Krul Tepes, Mika is afforded with supernaturally powerful strength and speed. He is able to avoid the detonation from a spell tag and partake in incredibly fast battling styles. Mika is agile and can leap to great heights. His regenerative capabilities allow him to heal wounds that would result in death for a regular person.

Urd Geales (ウルド・ギールス, Urudo Giirusu?) is a second progenitor of the vampires in the Seraph of the End series. He is ruler of Russia and the current leader of the Progenitor Council. Upon learning that a vampire city has fallen in Japan, he heads there with a host of vampire nobles, including Lest Karr. Sentencing Krul Tepes and Ferid Bathory for the consequences of their actions, Urd tasks Ky Luc with overseeing their sentence while he retakes the city.

Lest Karr (レスト・カー, Resuto Kaa?) is a third progenitor of the vampires who resides in Germany, Europe. He is one of the high ranking vampires to be a part of the Progenitor Council. While there is some tension between fellow third progenitor Krul Tepes, he is loyal to second progenitor Urd Geales. Coming to Japan and working closely with Urd, he would also have Ky Luc work with him as the vampires grappled with the rising threat of humanity, as well as the first progenitor. He is slightly well spoken and Over 2,800 100,000,000+ years old.