Yūichirō Hyakuya

Yūichirō Hyakuya 「百夜 優一郎, Hyakuya Yūichirō」 is a member of Japanese Imperial Demon Army's Demon Moon Squad and the main protagonist of the Owari no Seraph series.

Appearance
Yuichiro Hyakuya has medium dark hair which can be considered quite messy. He also sharp green eyes which fall under his thick play eyebrows. He is usually shown wearing a typical Japanese school uniform with a white sleeved T-shirt beneath.

After joining the Imperial Demon Army, he takes on their usual attire consisting of a black jacket with light green details. Dark gray trousers and black boots which go underneath his trouser legs. Yuichiro keeps his sheath on the left side of his hip. Sometimes he can be seen wearing the Japanese Imperial Demon Army hat.

Personality
He is a brave and fearless, as evidenced when he defeated one of the four Horsemen of the Apocalypse. He is very narrow minded person, whose goal is to annihilate all the vampires because of what they did to his "family", overcoming any type of challenge in order to accomplish it. Despite this he has a soft spot and worries first with his friends and only after with his goals.

History
He was abandoned by his parents since he was a child and he ended up at Hyakuya Orphanage. Since then, the kids of this orphanage were his only family. After Michaela gets possession of a map of the underground, both of them decide to leave the place with the rest of the chidren of the orphanage. However it is revealed that is was all a plan of Felid Bathory, one the Seven Founder, and the attempt to escape is frustrated leading to death of all the family except for him. After getting to the outside world he is found by Glen Ichinose, the captain of the Japanese Imperial Demon Army. In order to take revenge for his family, he decides to join the Japanese Imperial Demon Army to gain the power he needs.

Demon Weapon

 * Ashuramaru: Ashuramaru is a demon of the black demon series, it resides inside a black sword used by Yūichirō. Whilst in use, the blade develops a thick green aura. Like Shinoa Hīragi, he can call upon Ashuramaru to fully use its power to attack opponents.