Kiba Yuuto

As a Horse, Yūto possesses superhuman speed and is highly skilled with a sword. He has only been seen wielding one sword at a time but is depicted in his character profile as wielding two. Yūto's primary weapon is the Sacred Gear Sword Birth, which has the ability to create an infinite number of Demonic Swords at his disposal, such as the Holy Eraser and the Flame Delete. He later obtains a subspecies of his Balance Breaker called the Sword of Betrayer, which is the fusion of a Demonic Sword and a Holy Sword. He received it during the fight against Freed after "fusing" his Sacred Gear with the spirits of his comrades.

Yūto later gains a second Sacred Gear, the Blade Blacksmith, in Volume 3 (it was not revealed until Volume 10) and a sub-species of the Balance Breaker, the Glory Drag Trooper, which creates an army of Dragon Knights that he uses in his fight against Beruka Furcas.

In Volume 12, he obtains Gram, one of Siegfried's Demon Swords, after Gram left Siegfried to choose Yūto as its new wielder. The remaining swords chose him as their wielder in the wake of Siegfried's death.

Yūto possesses all the powers and abilities common to Demons, including the ability to cast spells. He has also shown some skill in the use of Illusions, such as those used to draw Siegfried's attention in battle in order to perform a sneak attack.

Yūto is a young man with short blond hair and gray eyes. Like Issei and the rest of the Kuoh Academy students, he wears the boys' school uniform, which consists of a black blazer with white accents over a white long-sleeved dress shirt with a black bow at the collar, black pants, and brown dress shoes.

Yūto is generally an optimistic, respectful person who cares deeply for his classmates. He is also a very kind person when it comes to his personality, even considering Issei's initial dislike of him.

He had a deep hatred towards holy swords, when the members of the Occult Research Club and the souls of his friends, who were victims of the Holy Sword Project, helped him overcome it.

Yūto has a marked hatred towards Holy-Sword wielders, priests, and fallen angels due to his past where he was part of a project called the Holy Sword Project, which led to the death of him, as well as all of his friends and other participants. After which he was revived by Rias to become her servant. He later learns sword skills under the tutelage of Souji Okita.