Yuuto Kiba

An 11th grade student. Self proclaimed best friend of Issei, and the school prince. He was a victim of the "Project: Holy Sword" where he was the only sole survivor. He became Rias' servant when she saved him from death, but still swore the accomplish his revenge to those who treated him as test subjects and disposed his friends. He also harbors a great hatred towards the holy sword Excalibur.