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.

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 and they were killed by Vampires. In order to take revenge for his family, he decides to join the Japanese Imperial Demon Army to gain the power he needs.