Water Gun is a modest Quirk with an outsized moment. Kota Izumi can fire a jet of water straight from his palms, and that simple stream is what bought Izuku Midoriya the opening he needed against Muscular in The Beast's Forest.
Kota Izumi holds this Emitter Quirk, which works at medium range and appears in Chapter 76 alongside Episode 42. There is nothing elaborate about the effect itself, but its uses have been decisive.
Activation sends a continuous stream of water out of the user's hands, aimed wherever they point. The output is a spray rather than a crushing blow, so its value comes from placement and timing rather than raw force.

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Kota is the sole user. He first turns the Quirk on Muscular, better known as Goto Imasuji, hitting the villain in the face with water purely as a distraction, which is what saves Izuku Midoriya after he has been driven into the ground. Once Muscular is beaten, Izuku calls on the same power for a very different job, asking Kota to help suppress the Blueflame fires racing through The Beast's Forest.
Kota Izumi is the character with a water-based Quirk called Water Gun, which lets him fire a stream of water from his hands.
Water Gun lets Kota Izumi shoot a continuous stream of water from his hands, aimed wherever he points, working more as a precise spray than a powerful blow.
Kota used Water Gun to spray water in Muscular's face as a distraction during the fight in The Beast's Forest, buying Izuku Midoriya the opening he needed after being driven into the ground.
Yes, after Muscular was defeated, Izuku Midoriya asked Kota to use Water Gun to help put out the Blueflame fires spreading through The Beast's Forest.
Water Gun debuted in Chapter 76 of the manga and Episode 42 of the anime, used by Kota Izumi.
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