百夜 優一郎

Yuuichirou is the main protagonist of the Seraph of the End: Vampire Reign series.

He is a member of the Japanese Imperial Demon Army and Hiiragi Shinoa's squad in the Moon Demon Company. He, along with Hyakuya Mikaela and a few others, possesses the seraph gene, which is relevant to the forbidden taboo and a focal point of the story Seraph of the End.

He is brave, fearless and somewhat reckless, not to mention hotblooded. Yuuichirou is often called an idiot by those who know him. He is a very narrow-minded person, whose only goal is to annihilate all vampires because of what they did to his "family," and he will overcome any type of challenge in order to accomplish it. He swore to exterminate all vampires for killing Mika.

Rather than revenge, his primary goal changes to protecting his new "family," in order to avoid a repeat of past events.

Similarly to how vampires do not bother to remember human faces and only think of them as "humans" or "livestock," Yuuichirou only sees vampires as "vampires" or "bloodsuckers" without bothering to remember their names or faces.

From url=http://owarinoseraph.wikia.com/wiki/Y%C5%ABichir%C5%8D_HyakuyaOwari no Seraph Wiki