This is a posable action figure from the Nendoroid series.
From Good Smile Company:
From the popular anime series "My Hero Academia" comes a rerelease of the fully articulated Nendoroid of the main character's childhood friend and rival - Katsuki Bakugo! He comes with three face plates including a confident standard expression, an aggressive combat expression as well as a sullen glaring expression.
His unique outfit that he calls 'Full Body Dynamite' has been faithfully converted into Nendoroid size, and effect parts to recreate his 'Explosion' quirk together with a 'BOOOM' text plate are included to bring his Nendoroid action scenes to a whole new level! Recreate your favorite scenes from the series and more!