Zuko wakes up with his hands bound behind him, in darkness, and sucks in a breath. Azula must have caught him and the rest of Team Avatar, they were going to be executed! Almost as if on cue, a blue flame lights up the shadows before him.
"Are you here to commit fratricide?" he asks, and Azula (it has to be her, even if he can't see a thing in here) chokes out a strangled gasp.
"What? Thought you wanted to become an only child. You do realize Father never actually liked one of us over the other? He just wanted us for our firepower." Zuko says. Azula isn't interrupting him. Maybe he can get everything out.
"I'm sorry I wasn't there for you, the past few years; I hadn't seen it then, and I was just following his orders, hoping maybe he'd respect me. But he didn't, and he didn't for you, and he never will, for any of us. I'm sure you're aware your life choices are questionable, but you don't have to go down that path. We can save the world together, if you help me, and I help you, because even though it's been ages since we've been a proper family, I still love you, and it might be too much to hope for, considering my current situation, but I hope some part of you still loves me. We can get past this; we can change things, as siblings instead of enemies." Zuko says, and Azula makes another one of those choking noises.
"What the [BLEEP]." a voice says.
"Shouto? Oh my God...Shouto. I'm so sorry, I swear by all that's holy, I had no idea. I got [bleeping] amnesia. I got hit on the head ten years ago and woke up with no memories. Dabi...no, my name's Touya. Todoroki Touya, oh my God. Everything came back at once, and I--I've always wanted to be the best, and you were the best to him, but you weren't, were you? This...this is awful." someone says, and Zuko looks up as the light flicks on. He stares at the scarred man before him.
"What the [bleep]." Katsuki says, again, from the chair behind Zuko. Zuko blinks, and looks closer at the man, who actually does look a bit like Natsuo--and didn't Touya have blue flames? Touya, who ran from the family before Zuko met him.
"...Touya?" Zuko asks, because there is no way he just sleepily monologued to Azula and every single word applied to Touya, but maybe for once, he'd actually caught a break.
"You're HalfnHalf's long-lost amnesiac brother? Of course you are." Bakugou says, wondering how exactly HalfnHalf recognized the other with the scars, because in every other reality, he had trouble doing so. Actually, HalfnHalf had just looked up, and was watching Scarface with astonishment, as if he hadn't known who the other was, when he was lecturing him. But he must have.
"Hey, they're awake!" the hand villain, Shigaraki, says, walking into the room. Scarface walks into a wall before running away.
"What did you say to him? No matter. What I really want to know are your cheat codes. Your mods. They're illegal for this console, and shouldn't work." he says. Katsuki grimaces. He must be talking about the magic. He'd explode them, but can't with the quirk restraints. He can't cast spells, either, as they siphon from his quirk power. But there is one thing can do, come to think of it.
"I'll show you, if you all close your eyes." he grins.
"And have you trick us?" the magnet woman asks.
"He cannot escape the quirk restraints. Besides, due to Sensei's newest ability, he will sense him if he tries to escape." Shigaraki says, and okay, what? No matter. Time to get himself and HalfnHalf out. Eight minutes there...
Quirk-restraining cuffs clank to the floor as Katsuki fricking disappears. The villain with the spandex suit, Twice, shrieks, and then they all panic.
"I told you! HE CHEATS!" Shigaraki screams.
"Find him!" Kurogiri shouts, and a good majority rush out of the room.
...eight seconds here. Katsuki rips the cuffs off HalfnHalf, and explodes. Then the two of them are running, and there's a portal coming after them, and all the villains, and oh [bleep, everything is fricked. And then some awful smoke is forcing itself out of his mouth, and Todoroki's too, and they're somewhere else, and someone's there; he's wearing a suit, and a helmet full of pipes. Katsuki knows this someone. It's the ultimate bad guy; All for One, and he steals people's quirks. Which is terrifying.
"I, like Tomura, am wondering how you managed that. If it's a secondary quirk, it's nothing you need any longer." the man says, and his fingers turn red and black, and he reaches--and HalfnHalf dives in front of him.
Zuko doesn't know what he's doing, but the man's elongating fingers stab into his chest, and all he can feel is fire--and it's gone. The man's fingers are smoking, burning.
"What. What kind of quirk is that? Why could I not take it?" the man asks. The guy was trying to take Shouto's quirk? Maybe...the firebending interfered.
"DIE!" Katsuki shouts, and throws an explosion, but the man waves it away as though it was nothing.
"Don't bother. I am All for One, All Might's nemesis." the man says. So, he's like, the anti-Avatar? Or something. Unluckily for him, Zuko is a master at fighting Avatars. He grins.
Katsuki stares as HalfnHalf leaps at All of One, twisting massive sheets of flame and launching an iceberg. The man removes both from existence, and waves his hand, and the floor rises up to trap HalfnHalf--but he dodges, like the ground trying to grab him is a normal occurence. It's interesting, how Shouto is always much better at fighting on Tuesdays. Maybe he can help. Katsuki casts the first spell he can think of--tripping, and All for One falls. On. His. Face.
Katsuki will treasure this moment forever.
He blows up a wall, and the two run full-on into a Nomu factory. HalfnHalf sets the whole thing on fire, sliding himself and Katsuki on an ice skateboard (skateberg? skateberg.) through the area.
"I didn't know you could make blue fire." Katsuki says, conversationally. HalfnHalf looks at the fire behind him.
"I can do that now? Take that, Azula!" he says, and they slide on. There are loud noises erupting everywhere.
Shouto!Himiko creates a massive iceberg, while Tenya and Izuku run Kirishima through walls and up the ramp. Soon enough, they're over the Kamino area, where All Might is fighting the Big Bad Evil Guy.
"Look!" Tenya shouts, pointing to two people sliding away from villains on a small skateberg (that's a word now).
"JUMP!" Izuku shouted, and there was a massive explosion, and Katsuki, trailing smoke, blew himself into the air. Kirishima held out his hand, and he grabbed on.
"Wait! HalfnHalf!" Katsuki shouted, but they were flying through the air, and a small red and white point watched them leave from the ground below.
"If we aren't going to get to keep the other, you can be ours." Shigaraki snarls, and Zuko flicks two swords into existence--and not just that. Half his face is covered in ice, the other in blue flame, formed to resemble a certain water spirit.
"Bring it." Zuko growls.
All Might, fighting for his life, is aided by how his enemy keeps tripping, as well as the storm of frost and fire only a few feet away. However, he's outmatched, and losing, and there is pain, and smoke, and he falls, and he's small.
But it's not the end.
"You're next!"
The villains teleport away; All Might saved the day.
He captured their leader, anyhow.
Things wind down.
Notes:
Zuko: what just happened
Katsuki: it was inevitable, really