Explosion: Katsuki's Quirk allows him to secrete nitroglycerin-like sweat from the palms of his hands and ignite it on command, allowing him to create strong explosions. The more Katsuki sweats, the stronger his explosions become. If Katsuki overuses this power, his forearms will start to ache.
Katsuki has a strong grasp on the applications of his Quirk, something that was acknowledged by Best Jeanist, a top Pro Hero, not only can Katsuki use the explosions for attacking, he can also use them to propel himself and navigate through the air at high speeds, allowing him to fly at his opponents without giving them time to react, as well as evade incoming attacks, even while in the air. The shockwave from an explosion can even be used as a shield.
Katsuki can keep up his explosions continuously, long enough to break through Eijiro's hardening Quirk and negate Shoto's "Heaven-Piercing Ice Wall" for a short while before being overwhelmed.
Explosive Speed : Katsuki throws his hands back and uses explosions to propel himself. He uses this both on the ground to increase his speed and through the air to achieve a pseudo form of flight. He first used this technique on the ground during the Quirk Apprehension Test. The first time he used it to fly was during the Obstacle Race.
Stun Grenade: Katsuki starts by creating a sphere of light between his hands that explodes into a large scale flash. Similar to the effect of an actual stun grenade, the flash of light blinds anyone close by. He first used this technique to defeat Fumikage Tokoyami.
Zero Distance Stun Grenade : A variation where Katsuki fires off his Stun Grenade at point-blank range of the opponent to immediately stun and immobilize them with little lasting damage. This variation was first used against Setsuna in the fourth round of the Joint Training Battle.
Howitzer Impact : This move is the strongest move in Katsuki's arsenal, which involves Katsuki taking to the air, and then using explosions to propel himself in a circular motion to create a tornado. This tornado builds up oxygen to fuel the incoming explosion. After colliding with the target, Katsuki releases the powerful aforementioned explosion. Present Mic compared the effectiveness of the technique to that of an actual missile. Katsuki first used Howitzer Impact in the final match of the U.A. Sports Festival Finals. He has also shown that he can release the fueled explosion in midair, without having to make contact with the target
AP Shot : Katsuki stretches out one of his hands and uses his other hand to form a circle on the palm of his outstretched hand. Katsuki then fires an explosion through the circle, which creates a concentrated blast beam. By focusing the path of his explosions into a single point instead of around his whole palm, Katsuki creates a concentrated blast with reduced area of impact, but with enough power to successfully pierce solid concrete.
AP Shot Auto-Cannon : A rapid-fire version of his AP Shot Technique. The explosion power is reduced in order to avoid dealing severe damage to human targets. This variation was first used against Seiji Shishikura in the first stage of the Provisional Hero License Exam.
AP Machine-Gun: A stronger version of his AP Shot: Auto-Cannon where Katsuki fires larger, rapid-fire explosions. This technique was first used against Tomura in the Paranormal Liberation War Arc.
Explode-A-Pult: While in mid-air, Katsuki grabs an opponent with one of his arms, then propels himself in a spinning motion by firing explosions with his free arm. Once he gains enough momentum, Katsuki forcefully throws his opponent with the aid of another explosion. He first used this technique against Togaru Kamakiri in the fourth round of the Joint Training Battle.
Land Mine Blast : Katsuki places his Grenadier Bracer on the ground and lets of a massive explosion into the ground, blowing back any obstacles surrounding him. This technique was first used to dissipate Mahoro Shimano's Hologram
Blasting Speed Turbo Cluster Just like with his Explosive Speed, Katsuki uses his explosions to propel himself forward, only this time, condensing them to become stronger and faster, allowing him to unleash a flurry of bursts that blast him forward at blinding speeds. This was first inadvertently used to save Izuku from Tomura and All For One.