Things never stop changing. When his Quirk manifests, Izuku finds that he can change things, in the most literal sense possible.

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 happened if he used his Quirk on people... (Or, What if Izuku's Quirk was the Fusion Ability from Dragonball Z/Steven Universe?)

U.A. is about to start, and everybody is ready to face any challenge. To bad said challenge throws at them the loss of their body and more, as the world experience a swapping experience of gain and loss. Hero, Villain, even the principal next door. Everybody has swapped bodies and sometimes Quirks. The future is either good or plain bleak as society faces this wacked up challenge.

What if Deku was born with a quirk? One that was vastly different from all other quirks, and more complex than One for All? What if this quirk was sapient, alive? Contains a sort of harem relationship between kids, be warned. Swapped to M for POSSIBLE lemons and gender change in story, but mostly for the violence and possible deaths (Also Futa Izuku)