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 black, 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.
Twin Impact (ツインインパクト,Tsuin Inpakuto?): This Quirk can cause any attack in an area to repeat in the same place a second time, just with several times the initial impact.
His surname, Shōda (庄田,Shōda?), is homophonous with Shōda (掌打,Shōda?), meaning "palm strike"; while his given name, Nirengeki (二連撃,Nirengeki?), means "two hit combo". Thus, his full name translates to "palm strike, two hit combo", which is a clear reference to the Quirk he possesses.
In the fifth volume, Horikoshi referred to this as his "greatest naming achievement to date."
Nirengeki's English voice actor, Dallas Reid, also voices Juzo Honenuki.
His appearance looks like Eric Cartman from South Park series.
(To Midnight and the other Sports Festival participants) "This is a contest of skill. Letting someone who didn't do anything advance... doesn't it defeat the whole point of the Sports Festival? Isn't it even against the rules?"