The Fusion Hero: Dekiru (Adopted)

Izuku was so excited when he manifested his Quirk. Being able to combine with objects to make himself stronger? So cool! However, what he didn't expect, what no one expected, was what would happen if he used his Quirk on people... (Or, What if Izuku's Quirk was the Fusion Ability from Dragonball Z/Steven Universe?) [S...