Azuma is an invaluable asset to Border. He used to be the captain of A-Rank no. 1 Azuma Unit, whose members later went on to lead their own A-Rank units. He has had several other pupils whom he mentored in strategy, a field he excels in. Together with his aptitide for leadership, he is held in high esteem by other Border agents, who will seek his help and follow his directives in battle even if they belong to other units. His outstanding analytical abilities assisted him in creating a plan with which he and his allies succeeded in defeating the powerful Lamvanein. His precise and insightful commentary of Rank Battles is very popular among agents, including the no. 1 solo combatantKei Tachikawa, to the point of drawing them to spectate matches. He can make accurate guesses about the unfolding of a conflict from its early stages and act accordingly, on top of having a reliable stock of tactics ready for multiple scenarios.
His latest mentees are the two Attackers in B-Rank Azuma Unit, whose placement in the ranking does not do justice to Azuma's competence on the battlefield. He was Border's first Sniper and remains one of the most skilled fighters of that class. His skills are such that he can hit moving targets from far away, and take aim and switch targets at remarkable speed.Hyuse was wary of Chika firing Meteor while Azuma might have a visual on her for fear that he'd be able to hit the bullet before or shortly after she released it, causing her to self-destruct. Azuma can also snipe through multiple walls by combining complex data and making fine adjustments on the spot. Furthermore, Azuma is capable of accurately selecting the Sniper Trigger most suited to the situation at hand. His skillset as the perfect Sniper is completed by his proficiency in stealth. Azuma is in fact notoriously elusive, having bailed out only once in the sixth matches his unit fought during the latest season of Rank Battles due to all threeopponentteams focusing their fire on him. Even Masataka Ninomiya, the no. 2 solo combatant and no. 1 Shooter with enough trion to block Azuma's Ibis and the latter's former student, was convinced that it would be impossible to find him if he did not open fire and hid to avoid being picked off. Masato Kageura, a top Attacker famous for his aggressive fighting style, did the same. Thanks to his ability to fight impassionately, Azuma is in fact one of the only two people in Border not to trigger Kageura's Side Effect.
Outside of involvement in Border's fighting force, Azuma is a postgraduate engineering student who conducts experiments to determine the composition of trion who has also researched military history and tactics. Additionally, he is a skilled mahjong player and fisher.
Azuma is an exceptional Ibis user. Despite its low bullet speed, he made it his main offensive Trigger, compensating for that downside by predicting the target's movements. This skill, in conjunction with his accuracy, enabled him to hit Lamvanein while the latter was flying. Azuma can also take out an enemy by sniping through multiple walls, an extraordinary feat which he can accomplish by combining observational data from himself and his teammates as well as detailed topographical information. However, he rarely does so, preferring to avoid giving away his location if he is not sure to hit. Nonetheless, on at least one occasion he used Ibis to fire after revealing his position, possibly capitalizing on his ability to anticipate their movements as well as on the general impossibility of stopping this rifle with Shield or Full Guard. It is also his Trigger of choice to fight at mid-range. He seems to prefer to remove Ibis's bipod to carry it more easily. On one occasion he had its color changed to white to camouflage in the snow. He is first seen using this Trigger in Chapter 44 (Episode 22 in the anime).
As a Sniper, it is essential for Azuma to use Bagworm in order to prevent his trion signature, and therefore his position, from being picked up by Radar or similar Triggers. If he has previous knowledge of the battlefield, he can have engineers modify Bagworm's color in order to camouflage himself, making himself even harder to find. On one occasion he conjure dand then took off his Bagworm to serve as a decoy. Azuma is first seen using Bagworm in Chapter 58 (Episode 27 in the anime).
Azuma is extremely competent with Lightning. With his ability to change targets at incredible speed, he can make the most of its high rate of fire, shooting Yūma in different spots so he could not defend and hitting Hiro Kitazoe's Meteora bullets in mid-air without wasting a single shot, a feat that the Gunner, a former A-Rank agent with a capable Sniper on his own team, regarded as outstanding. Azuma was first seen using Lightning in Chapter 114 (Episode 69 in the anime).
Azuma uses Dummy Beacon to gain a tactical advantage on the enemy, disturbing their Radar. He sets them in locations which he anticipates will be key to resolving the conflict. In general, he sends out only a few, but on one occasion he filled an entire mall with them, enlisting his Operator's help to activate them all at the same time and have them give off his teammates' trion signatures as well. Although deploying many Dummy Beacons is very trion-consuming, it has the additional benefit of adding another layer to the diversion wherein if the opponent focuses on attempting to tell the decoys apart from the signatures of their opponents by their movements, the split focus will make them easier for Azuma to snipe. Azuma is first seen using Dummy Beacon in Chapter 169.
Owing to his proficiency in stealth, Azuma rarely needs to activate Shield, but when he does he seems to prioritize his vitals even if it means leaving his legs vulnerable. He has only been seen erecting a hexagonal barrier. Azuma is first seen using Shield in Chapter 175.