Nirengeki is a chubby young man of average height, with short, ice-blue hair and a round face. He has large, wide eyes with small pupils, and is usually seen looking a little sheepish and apologetic; his eyebrows are almost always pointed upwards.
His hero costume consists of a navy blue, high-collared suit with a trim of thin pale lines around its collar and hem, and a similar pattern over his torso and shoulders, along with plain black pants and knee-high boots. A scouter-looking device is worn over his left eye, and he has a connected radar on the back of one of his gloved hands.
Nirengeki has a very humble attitude, as he will not take credit for something he does not feel he earned by his own strength. He's good friends with Tenya Iida and complimented Ashido on her punch afterwards, implying that he is mature and does not hold grudges.
Overall Abilities: Nirengeki is a rather competent fighter who not only excels in one-on-one combat, but also possesses good Quirk handling. His Quirk, Twin Impact, allows Nirengeki to remotely cause attacks to repeat a second time, but with significantly amplified force involved compared to the initial impact. He can also exploit his Quirk for mobility purposes, such as jumping higher and dashing faster. Nirengeki also has good camaraderie, augmenting the attacks of himself, and those of his allies, when their initial assault doesn't have sufficient strength. The more potency there is behind a base attack, the stronger it will become when Nirengeki enhances it. Nirengeki's overall abilities make him a pivotal, supporting asset to have on a team, wherein he can increase the singular attacks of his comrades, or the collaboration attacks initiated by him and his comrades working together, as there's only so much force he can produce on his own.
During the Joint Training Battle, Nirengeki not only demonstrated his comradeship by mangifying the cooperation attack enacted by Reiko Yanagi and Yui Kodai, but showcased impressive reaction time. After reading the sporadic movements of Minoru Mineta, he was able to defeat the Fresh-Picked Hero with a single punch. And while Minoru's constitution may not be very high, to defeat someone in a single hit is quite the feat on Nirengeki's part. His abilities eventually garnered the attention of the Lion Hero: Shishido, giving Nirengeki the opportunity to intern under the No. 13 Pro Hero, and improve on his flurry of attacks and the ability to read ahead of situations.
Tactical Intellect: Nirengeki has been shown to be very astute, as was able to immediately deduce that Mina Ashido had blocked his attack, despite it not being visible to him, considering he had to rely on the use of his tracker.
Twin Impact (ツインインパクト Tsuin Inpakuto?): Nirengeki's Quirk , Twin Impact, allows Nirengeki to, at the site of any initial impact, make the point of contact receive a second impact. The second impact is several times stronger than the initial blow.
He also uses his Quirk on objects to send them flying at opponents or to send possible weapons away.
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Impact Location Recording Devices: Nirengeki wears gloves and a scouter-like half-visor over his left eye. These devices allow him to keep track of the places where he landed a blow, allowing him to activate his Quirk at the most ideal times.