Sonic Prime X My Hero Academia: Stronger together

The Ultimate showdown!

(Just a BIG disclaimer, I nerfed Sonic Prime severely for this fight so you guys get more enjoyment, your welcome :3)

Sonic, Midoriya and All Might stand there in front of All For One, waiting for an attack to come, "I know you two can't fight unless provoked, hero licenses or not" All For One says, Sonic grunts in frustration, of course he would know about that, "Your days of evil doing end here!" All Might exclaims, leaping forward, "Detroit, SMASH!!!" All Might yells, his fist connects, but when the dust settles, All For One was standing there, not a single mark on him, "Your weak compared to me, get out of my sight" All For One says, smacking the Symbol of Peace away, knocking him out, Sonic and Midoriya look on in horror as he was sent flying, "Sonic, we gotta do something, right?" Midoriya asks, Sonic nods, "Yeah, lets make our friends proud, and show the world what we're made of!" Sonic exclaims, powering up, the two leap at All For One, ready to beat him into the ground for what he did, but don't get a chance as their assault was cut short by Dabi and Shigaraki, the two half-Saiyan's barely dodge the blue flames, landing a fair distance away, "Deku, you handle Crusty the clown, I'll go for purple's" Sonic says, lunging at Dabi, landing an elbow strike, following it up with a backward roundhouse, following him closely.

Meanwhile, Midoriya runs at Shigaraki, getting as close as possible before jumping over him, sweeping his legs from under him, following it up with a donkey style double kick, sending him flying into the air, Midoriya flys up to Shigaraki, landing punch after punch, left, right, left, upper cut, finishing it with a heel kick to the skull, the impact with the ground knocks out the villain, Midoriya turns to the ground just in time to see Sonic knock out Dabi, landing next to him, the two focus their attention on the villains in front of them, "We'll need to look out for compress...keep distance from him, use ki, Toga is easy for me to stop since i can regenerate, Twice is a waste of time, just creates clones, deal with him later" Sonic says, finishing his on the fly analysis, before the two went back at it, facing their respective opponents.

Sonic dispatches Toga fairly quickly before moving in to help Midoriya take down Compress, both narrowly dodging a death touch from the villain before firing a double ki blast at him, knocking him out, Twice goes in for the attack, creating clones of himself, but he and his clones were dealt with little problem, "So, its just us that remains huh?" Sonic asks All For One who had watched their fight, "Yes...yes it is, but before we continue, would you two like to hear a story?" he asks, Sonic and Midoriya exchange looks, slightly confused, was he stalling? No, that would be too simple, he was up to something, then it clicked, "Kurogiri!" the two exclaim, blasting energy at random, which by some miracle, collides with the shadowy villain, causing him to stumble, "Get him!" Sonic exclaims, the two launch themselves at the villain, landing a kick at his metal neck brace of sorts, "Guess all your minions are out for the count All For One, now its just us versus you" Midoriya says, Sonic standing next to him.

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While Sonic and Midoriya were fighting, all of the members of Class-1A were working together to get people out as fast as possible, and were almost done when they saw a massive plume of dust blast towards the sky, "Wait, Sonic and Deku are still in there!" Uraraka exclaims, people look at her with shock, the mass of people watch as a screen appears in mid-air, no doubt one of Sonic's holo-screens, but were introduced to a horrific sight, Sonic and Midoriya were being brutally beaten up, watching as Sonic blocked a punch, getting sent flying into a wall, Midoriya followed up with a powerful right hook, but it did nothing, All For One punches him away, causing him to slide a few meters through the ground, he gets up slowly, blood was dripping down his face, Sonic gets out of the wall, wiping his mouth with the back of his hand before the two leapt at him again, repeating the process.