"I think that Iida should be class rep," Arget says as Iida steps up and thanks Arget.

Timeskip brought by Arget using ROAD ROLLER on Nomu

"Everyone get onto the bus in an orderly fashion," Iida says before having a small breakdown at the layout of the bus.

Timeskip

"What's that weird purple mist?," Kirishima asks.

"Villains, and real ones, with a big creature that has more muscle than allowed by nature and a beak," Arget says before Aizawa jumps down and attacks the villains.

A mist man scatters the class and Izuku and Arget call their stands and show the entities to their groups.

A/N: Arget's Stand

Izuku's Stand

Back to the action.

"MUDAMUDAMUDAMUDAMUDAMUDAMUDAMUDAMUDAMUDAMUDAMUDAMUDA!"

A villain is sent flying and [Everything Black] opens a portal to Izuku's group.

"Wondered when you'd appear,"Izuku said matter-of-factly.

"We were busy," Arget said back.

Arget jumps down to help Aizawa and throws a blade, cutting the finger off of the Nomu, Shigaraki told it to kill Arget and it attacked.

"HAHAHAHA!!!! RODORORA!!!!(Road Roller)," the road roller comes down from the sky like normal and Arget and Nomu begin fighting.

A/N: replace DIO with Arget and replace [The World] with [Everything Black]
Let's get back to the action.

Nomu is crushed by the Road Roller and it's upper half comes out without legs, it's chest is then impaled by Arget's hand and shrivels up into a husk, Arget gets more muscular and his wounds(which are minor) heal.
(Sound like somebody?)

"H-how?!?! With just one attack!!," Shigaraki is angry(understatement) and wants revenge, but is warped away by mist man.

The class was safe.