Kiba, Yuuto

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.

Yuuto made his appearance in Volume 1, bringing Issei to the Occult Research Club under Rias' orders.

As a Knight, Kiba possesses superhuman speed and is heavily skilled in swordsmanship, what Issei has called God-Speed.

Kiba's primary weapon is the Sacred Gear "Sword Birth," which has the ability to create an infinite number of Demon Swords at his disposal, such as the Holy Eraser and Flame Delete. He later obtains a sub-species Balance Breaker called "Sword of Betrayer," which is a fusion of a Demonic and a Holy Sword. He received it during the fight with Freed after he "merged" his Sacred Gear with the spirit of his comrades.