this contains spoilers from the anime/manga, don't continue if you don't wanna get spoiled <3
This is what everyone has been training for. The big fight against All For One. You and your class have been training non stop to be as strong as possible. Monoma, a member of Class 1B, has been training to handle Kurogiri's Quirk to help with the fight. And now it was happening. He gets to pull the strings.
After warping Shigaraki and some other heros to the 'Coffin in the Sky' - a flirting island with an electrical barrier - he's sitting on a conjoined island, with Eraserhead and Manual. By constantly touching Eraserhead and with Manual using his Quirk to keep his eyes moist, he's able to copy Eraserhead's Quirk for more than five minutes. He's not just a side character anymore.
"I'm pulling the strings now!"
He exclaims, grinning excitedly. And you're inside the makeshift arena, with Mirko, Best Jeanist, Bakugou, Nejire, Tamaki, and and other heros.