|Alias||Destruction God 「破壊神 Hakaishin」|
|“||Surpass your limits. Right here. Right now.||”|
Yami is a tall man with a muscular build. He has black eyes and black hair of medium length that is messily combed backward. Additionally, he also sports a stubble mustache and beard.
Yami's attire is very simple and consists only of a white A-shirt and black trousers. The trousers have an extra layer of tan leather that covers his outer thighs and down to his knees. The trousers are only supported by a belt around his waist. Yami wears another pair of belts, one of which he uses to carry his grimoire. Lastly, he wears black high boots that cover most of his calves.
As the captain of the Black Bull squad, Yami wears a black banner with the squad's insignia on it. He wears it over his right shoulder and it is attached by two strings to his left shoulder. The banner also has tattered edges, seeming to have been ripped off from a bigger banner.
Yami is normally a very quiet person that only speaks a few words. However, he is also a hot head, who could be easily enraged by something as small as being bumped by another person. Yami also has a penchant for intimidation whether he uses threatening words or physically hurts his target. He also tends to immediately go straight for a more physical solution to any problems or confrontations, such as when he destroys a part of the squad's headquarters to calm his subordinates.
Furthermore, he also prefers instilling tough loves to his subordinates by giving them dangerous missions. He believes that it is the best way for them to overcome their limits and grow stronger. Yami also does not discriminate people according to their social status or circumstances where he is willing to accept Luck Voltia, Noelle Silva and Asta to join his ranks, even though he is aware of each of their problems.
He was born in the Land of the Rising Sun to a pair of fisherman. As a young man, he goes fishing, shipwrecks, and washes ashore in a strange country. There he is met with troubles because of culture shock and racial discrepancies, but after beating up those who troubled him, he becomes the boss of his own group.
The day after his nineteenth birthday, Yami is enjoying noodle soup when the Thorn Magic curse on House Roselei causes the soup to spill on him. Cutting through the thorns, Yami confronts and chastises Charlotte Roselei for relying only on herself. At that point the curse is broken and dissolves because Charlotte falls in love with Yami.
Before the Magic Knights Entrance Exam, Asta runs into Yami and other members of the Black Bulls squad. Yami threatens to kill the boy but is stopped by the beginning of the exam. During the exam, Asta's athletic ability and determination impress and weird out the Black Bulls captain. When none of the other captains recruit Asta, Yami releases his Magic Power and tries to intimidate the boy. However, Asta remains determined, and amused by the boy's response, the captain recruits him. Angry about Asta making him wait, Yami threatens the boy again and then throws him through Finral Roulacase's portal to the Black Bulls' base. There, Yami welcomes Asta to the squad.
- Dark Magic: Yami uses this form of magic to generate and manipulate darkness. He primarily uses this magic to increase his physical abilities and by channeling it into his sword. This magic also has the ability to draw in other forms of magic, namely Light Magic, absorbing it into the darkness.
- Reinforcement Magic: Yami uses this form of magic to enhance his physical abilities. It also allows him to make up for the slow speed of his Dark Magic.
- Master Swordsman: Yami has described himself as a magic swordsman. He is highly proficient in swordsmanship; he easily fights on par with Licht, the leader of White Night Eye, with nothing but swordplay in conjunction with his Dark Magic, destroying the surrounding environment.
- Immense Strength: Yami is extremely strong, as he easily throws Asta a considerable distance with just one hand. He also has incredible leg strength, shown when he jumps to the top of William Vangeance's Great Tree Misteltein.
- Immense Reflexes: Yami possesses excellent reflexes, blocking Licht's light blades with ease when his subordinates and others couldn't even react to their speed, and nonchalantly counters the latter without having to turn around.
- Immense Durability: Yami is an extremely durable fighter, being unfazed when hit by Licht's light blades, and emerges completely unscathed at his attempted cave in.
- Enhanced Speed: Yami is very fast, surprising someone as fast as Licht with his speed. When Lotus Whomalt attempts to launch a surprise attack on William Vangeance, despite having to climb a massive tree, he arrives just in time to intercept him.
- Ki: A principle originating from his homeland, this skill allows Yami to use a sixth sense to perceive and react to unseen attacks or persons.
- Immense Magic Power: As a captain of a Magic Knights squad, Yami possesses an immense amount of Magic Power, shown when the anti-birds flee as soon as they realize his presence. This is further proven when the slightest release intimidates multiple people. After Yami blocks and counters Licht, Valtos wonders if the captain could rival the Magic Emperor. Gifso, the High Priest of the Seabed Temple, acknowledges Yami as being too powerful for his game. After watching his squad fight at the brink of death, he surpasses his limits to escape the White Night Eye's dimensional trap, and becomes powerful enough to defeat Vetto. Julius Nova Chrono states that Yami has grown more powerful after he returns to the kingdom.
- Grimoire: Yami possesses a three-leaf clover grimoire, which contains darkness-based spells that he uses during combat.
- Katana: Yami uses a katana in combat. It is from his homeland, the Land of the Rising Sun. It was broken by Vetto durning their first encounter, but replaced with a brand new one afterwards.
- "...In the end... the most important thing about a Magic Knight is... magical power." 「...なんや かんやで... 結局魔法騎士に 求めりれるのは 魔力だ "... Nanya kan'ya de... Kekkyoku Mahō Kishi ni motomeri reru no wa maryoku da"」
- "Surpass your limits. Right here. Right now." 「今 ここで 限界を 越える "Ima koko de genkai o koeru"」
- "Protect whatever is precious to you. One day it'll lead you to protect something else." 「テメーはテメーの護りてぇもん護ってりゃいいさ いつかそれが誰かの為になる Temē wa temē no mamoritē mon mamotterya īsa Itsuka sore ga dareka no tame ni naru」
- Yami's favorite things are tobacco, coercion, and interesting people.
- Yami is the most muscular character.