Most people will tell you that Tuesday is nothing special. It's not the beginning of the week, nor the middle, nor the weekend, nor Friday, which is important because it's just before the weekend, and everyone looks forward to then. However, Tuesday, though nothing remarkable, was the day Iida Tensei, sometimes known as Pro-hero Ingenium, took his five-year-old brother to the park. Of course, he did so often. What was different about this particular Tuesday was that it was the same day a young girl, ostracized for her quirk, had escaped a villain attack and ran away for good. It's not like anyone was left to take her back; not that they would have, had they survived. Her travels took her to a certain park, where she met her first friend in a while.

"I'm Iida Tenya." said the boy with engines in his legs. "Toga Himiko." the girl replied.

Fate is a curious thing. There's no such thing as 'supposed to be' except when there is. And in this case, the two were fated to meet once, go their separate ways, and not see the other again until a forest burned blue, and by then have forgotten. However, fate only has a certain amount of true control; and what they could not control was the general speed and force with which Tenya waved his hands in the air, because Ingenium was the best hero in Japan and no one can tell Tenya otherwise--

It's interesting how many lives were changed with a simple

THUNK.

"Owww!" Tenya shouted. Slamming one's hand into a picnic table hurts.

"Can I see?" Himiko asks, looking at the small cut on her friend's hand. Tenya finds no trouble in that request, and holds out his hand. Himiko, displaying the general lack of self-restraint common of most five-year-old, licks it.

"Hey!" Tenya shouts. Tensei is not sure what to think of this, and walks over, reaching the table in time to see the girl Tenya had been talking to magically (quirkily?) assume Tenya's appearance. There was a single second of silence, and Himiko knew she'd messed up. She'd just made a new friend, and--

"Your quirk is so cool! Tensei, look! She turned into me!" Tenya shouts, and slams his hand into the table again.

"You--you don't mind?" Himiko asks. Tensei, somewhat concerned by the general creepiness of the girl's quirk--were those fangs?--was smart enough not to say so.

"Of course not." he says, realizing that though he had some tact, many did not. Himiko's quirk was one that would get her discriminated against, he thought. That was when Himiko burst into tears, and Tensei learned some things.

A few days later, there was one new (foster) member of the Iida family.

"You're like Shouta." Hizashi said, when he found out.

"He's always adopting cats." However, that's for later. Back to Tuesday;

One of said stray cats, running through the city, avoided getting vampirized by the fact of Himiko's absence from the forest that hour, and ran in front of a car. The car swerved, knocked a crate off a tower of them, and the crate landed on top of a young man, skin stapled together, who was hiding in an allyway. He woke up with amnesia, knowing nothing about his life--at all. Naming himself after his quirk, and with the only things guiding him being a desire for self-knowledge and an irrational hatred for Endeavor, he moved on, after accidentally melting a pipe in said alley, when waking up in a panic. The melting of the pipe caused an issue in the building, and so while a family waited in the library for the issue to be fixed, a twelve-year-old with hair that was black, no it is not dye, wait is it? met a five-year-old with lots of purple hair and a brainwashing quirk. The two exchanged emails before going on their separate ways, and Hitoshi was inspired to become a hero. Use your quirk without hurting yourself, he'd said to the other, who had been overjoyed to discover there was a fashion, a way of moving the flames, that allowed him to use his quirk beyond his limits without getting burned, he'd figure it out, but this boy's amazing quirk had helped him, he could help others, he could become a hero. The two kept up their communication, over the years.

Dabi, texting his friend without looking at the path before him, ran into a woman, who accidentally used her quirk on him.

"What does it do?" he asked her.

"It's really strange and specific. Um. So if you have a brother, and he is, at the moment, being affected by someone else's quirk, and if someone who was born at the same time and with similar life experiences as your brother is being affected by the same kind of quirk as your brother, they'll get bodyswapped. For the full day. And every other of the same days of the week after it, every week, unless I can touch both at once and reverse it. Um. Do you have a brother?" the woman asked. Dabi stared at her a moment.

"No clue."

Shouto was sure the training mat had not been stone, a minute ago. And why was everything red? And what was wrong with his hair, and he felt really strange and since when could he summon fire from both hands and he was going to pass out now.

Prince Zuko, while training his firebending, experienced a similar sentiment.

Somehow, the two rather confused boys managed to get through the rest of the day, each realizing somewhat they had been shoved into the body of someone on another planet. Zuko, though two years older than Shouto, had been, by virtue of the way time works across the endlessness of space, had been born at the same time, and fate found things too interestingly similar between them to resist being able to switch the two.

They thought it was over, until the next Tuesday, at which point each wrote a note for the other, and things were figured out. Fuyumi discovered what was happening, kept a secret from her father, and decided she would adopt Zuko, at least on Tuesdays. Neither's father, Ozai or Enji, found out, and Fuyumi realized that though Zuko's situation was terribly worse, it wasn't all that different, and a few months in, she re-evaluated her life, and some years later, when she was old enough, moved out with her two brothers and won the ensuing custody battle. Rei was doing better as well, and the family became four. Fuyumi only regretted that she could not save Touya, because he was long gone; that she could not save a similarily blue-fired sibling, because she was a galaxy away; because she could not save all those that needed help. She did her best, though, and that was all any good woman could do.

Azula was often deeply suspicious of of her dorky brother, and boiled it down to: he's weird on Tuesdays. The day after his Agni Kai, the day before he was to be banished for good, was a Tuesday; he'd looked in the mirror at his new scar, and laughed dryly.

"We match now." he'd said.

That was not the end of that fateful Tuesday; no, there was one more soul caught up in the butterfly effect. Bakugou Katsuki, running from the playground a few days after his best friend Izuku was declared quirkless--how could they be heroes together now, they couldn't, Izuku was just a Deku--ran into a cat that should have died, drained of blood, a few hours earlier. A life living longer than fate had accounted it for caused trouble, at least until the timeline sorted things out. Katsuki patted the-cat-that-should-not-exist at the same moment as the timeline figured itself out and the cat ceased to exist, dragging Katsuki through The Place Between as it vanished. Katsuki's soul left reality for exactly eight seconds there...

and exactly eight minutes in a reality where there were no quirks at all.

And what Katsuki realized was that in a world where everyone was quirkless, everyone was

Still

The

Same.

He was no stronger nor weaker than Deku, there, and yet his alternate self believed he was, as did all the other extras--they treated him the same. Which made no sense. And if it didn't make sense there--why did it make sense here? It really didn't, when he thought about it.

Every night, he traveled. Every night, somewhere different. By the fifth one, Izuku was his friend again, and the two continued as if they had never paused. They'd be the greatest heroes, not only of Japan, but of all the other realities too, if Katsuki had anything to say about it. And he had a lot to say about it; since the universe in which a quirkless Izuku had defeated a League of Villans, he'd realized that anyone who could look down on his friend was stupid, as Izuku carried around notebooks of mass destruction, holy frick the stuff written in those was dangerous.

Another thing he'd been thinking of: how do quirks even work? Most mutation ones are pretty straightforward, but just--he can produce sparks from his fingers. Never mind the nitroglycerin--that was biological--but sparks. From his fingertips. How? And that didn't even touch on the quirks that were just plain weird. Ingenium has engines in his arms. Biological, metal, fueled, speed-increasing, engines. Just--what the frick?