Looking around at Musutafu National Park, Natsuo asked, "How did Touya manage to explode so hard he sent us all to another universe?"

"We're not sure that's what happened yet," Fuyumi said. She knelt down on the ground, holding an icicle to Dabi's forehead. The oldest Todoroki child was in bad shape, burned and fire crackling under his skin. The icicle was frankly a Band-Aid on a disaster. Judging from the unhappy look on Fuyumi's face, she knew it.

Shouto cleared his throat. "Natsuo has a point. This park was crushed during Gigantomachia's rampage. How could it possibly have been restored? And how would we all have ended up here? There are quite a few documented cases of people traveling to parallel universes on my favorite conspiracy theorist website."

One moment, the entire Todoroki family had been united in trying to stop Dabi from blowing himself up. The next moment, Fuyumi, Natsuo, Shouto, and Dabi had appeared in this bright and sunny park. Even the time of day had changed. Fuyumi sighed, then acknowledged reality. "Only Touya could be dramatic enough to break the barrier between universes." Dabi stirred and coughed slightly. Fuyumi smoothed his hair. "Why aren't Mom and Dad here? They were also right next to the explosion."

Natsuo rolled his eyes. "Dad always manages to worm his way out of consequences. It's a universal law. Shouto, how can we get back?"

"Do you seriously think we can count on Shouto's conspiracy theories to help us?" Fuyumi hissed.

Natsuo whispered back, "Do you have any better ideas?"

Shouto looked between them. "According to my online friends, most visits to another universe are brief. We'll snap back home soon. But we'd better stay close together. If not, someone might be accidentally left behind."

Natsuo threw up his hands. "Fine, Yumi, you were right, that was completely useless."

Indignantly, Shouto said, "Sheep09 seemed very certain. They said they accidentally brought back a unicorn to our world by touching it. They even had pictures."

"I suppose in the modern world of quirks, no one would notice a unicorn." Natsuo snorted. "But I still think that was probably Photoshop."

Fuyumi rested her palm on Dabi's forehead, then frowned at the temperature. "We need a doctor for him ASAP."

"I'm a medical student," Natsuo said.

At the same time, another Natsuo said, "I'm a doctor."

The siblings looked up at a man identical to Natsuo Todoroki, if maybe a year or two older.

In a slightly stunned voice, Fuyumi said, "Another universe indeed."

The older Natsuo frowned. "Another universe? I was worried that you might be a double created by my father. Why, I'm not sure, but it seems like something he'd do."

"Our dad does like to replace his children," Shouto said.

The older Natsuo dropped to his knees next to Dabi and pulled out a doctor's kit. "Fascinating, his burns are closing up. His ashes should be already in an urn, but I think he's going to make it. This isn't regeneration, exactly. Is he a Nomu?" His hands flew as he spoke, applying a slave and bandages.

"He might be something like a Nomu," Shouto said.

"It's the only reason he's not dead. Does he have any allergies to painkillers?"

"No," Fuyumi said.

Doctor Natsuo grunted. "Good." He injected a needle.

A blur with white hair and red eyes shot over. "Natsuo! There you are!" The giant man picked up the younger Natsuo and carried him away. His retreating figure became a dot in seconds. It happened so fast, no one had time to react.

Doctor Natsuo groaned. "I'm sorry, my dad must have mistaken your sibling for me."

"Wasn't that All for One?" Shouto demanded. "He looked blurry, but his voice sounded like All for One."

Doctor Natsuo said, "Yes, he's my father. Isn't All for One your father in your universe?"

"Slightly worse," Shouto said glumly. "We got Endeavor."

"What's an Endeavor?" Doctor Natsuo asked.

Natsuo Todoroki considered himself the most normal person in his abnormal family. (Outsiders might nominate Fuyumi for the honor, but he knew better. She was absolutely terrifying when angry.) Mostly Natsuo just got caught up in the antics of his relatives, which he privately rolled his eyes at. He was a nonentity in his family. His father had forgotten that he existed. The media only knew about his oldest and youngest brother. Even when Natsuo had ended up in another universe, he'd been certain the weirdness was all his siblings' fault.

Never before had Natsuo imagined that the number one villain would abduct him. And he certainly hadn't expected to end up inside a bank vault.

It was a fancy bank vault, admittedly. The giant space had three separate rooms partitioned off with wood paneling, including a bedroom, a bathroom, and a kitchen. But it was still very clearly a bank vault.

"What?" Natsuo asked aloud.

The question had been directed at the universe at large. However, All for One took it as directed at him. "Son, I specifically told you not to move out, and you insisted anyway. What did you expect to happen? This is the safest place for you. I have all your favorite food and entertainment. I'll set up a doctor's clinic at home so you never need to leave."

"I'm not your son," Natsuo said firmly. "I already have Endeavor as a father, I refuse to accept another terrible dad. Especially not one who also considers me so forgettable he can't tell that I've been swapped with someone else."

"What kind of endeavor do you mean?" All for One raised an eyebrow. "Your mother would certainly tell me that I'm an endeavor of a husband."

"Mom? Is she here?"

"She said she would bring us snacks." Someone knocked on the door, and All for One smiled. "There she is." Using a quirk, he opened the vault door without needing to walk over.

Rei Todoroki sauntered in. She wore a shimmering blue gown and enough jewelry to start her own store. Every finger gleamed with multiple rings. She carried a tray of chocolate chip cookies. "Natsuo, it will be good to have you home, even if I don't agree with your father's actions. I'm staying neutral in your argument." She double-took when she saw him. Then she chuckled to herself.

Finally someone could tell the difference between the Natsuos. "I'm not your real son, I'm from a parallel universe. Please explain it to your husband."

All for One laughed. "You'll say anything to get out of the vault, just like when you were a little boy. You'll always be my baby, of course."

Rei repeated, "I'm neutral in this matter." She winked, set down the cookies, and left.

Natsuo shouted after her, "Still an expert in turning a blind eye, huh, Mom?"

The Todoroki siblings (including the odd one out) had a brief debate on what to do next. Doctor Natsuo insisted he needed to take his patient (Dabi) to his hospital at once. Shouto wanted to chase after All for One. In fact, Shouto did chase after All for One, only to return sheepishly a few minutes later admitting he'd lost the trail. Since Doctor Natsuo said his father wouldn't hurt his other self, Fuyumi ruled that getting Dabi medical treatment was top priority.

At the hospital, Doctor Natsuo stabilized Dabi inside a strange tube that did not look like anything the siblings had seen in a hospital in their world. Then he took them to a break room with a table and a vending machine. The snacks at least looked normal. Shouto, exhausted from using his quirk, gratefully guzzled canned tea. Doctor Natsuo asked, "How did you end up in another world?"

"Dabi," Shouto said as if that explained everything.

Fuyumi elaborated: "Our older brother unleashed an explosion that somehow caused…this."

"I have three siblings in my world?" Natsuo smiled. "I always thought it would be nice to have siblings, if only to divide up Dad's overbearing attention."

Fuyumi said, "I'm glad you got to be the family favorite for once. A devoted father must be quite the change of pace."

"It's not all it's cracked up to be," Shouto said.

"All for One is a weird mixture of devoted and not. He'll ignore you, then as soon as you pull away, he's all 'I love you, I need you.'" Doctor Natsuo did a decent imitation of All for One's voice. "You four were lucky enough to have a different father?"

"Enji Todoroki is our father, and lucky isn't the word I'd use. Not even with All for One as the alternative," Shouto said. "Rei Todoroki is our mother."

Doctor Natsuo raised his eyebrows. "Rei Himura is my mother."

"I wonder if we're Enji's children with someone else," Fuyumi said. "Maybe even a happier, non-quirk related marriage…"

Doctor Natsuo shook his head. "Sorry, Enji Todoroki doesn't have any children in my universe. I don't think you three exist."

"You know him?" Fuyumi asked.

"He works in this building. It would be easier to show you."

As the siblings trailed after Doctor Natsuo, Fuyumi said, "So Dad is a doctor? I hope it makes him happier than heroism."

"Nope." Doctor Natsuo opened a door. "He's the barista at the coffee shop in our hospital."

Enji Todoroki stood behind the counter, wearing a bright red apron. Next to him, Hawks was mixing a drink.

Enji bellowed, "KEIGOOOOOOOOOO! You put too much milk in that latte."

"Sorry," Hawks sighed, reaching to redo it.

"How will we ever take down Starbucks if you can't make the perfect latte?" Enji's face reddened as he warmed to his rant. "I saw All Might enter a Starbucks just yesterday! I'll never forgive the number one hero for promoting such an inferior brand!" His fist waved.

Fuyumi and Shouto stepped outside to restrain their giggles. Shouto said, "Some things never change no matter the universe, huh?"

"I wonder how Dad and Hawks became baristas instead of heroes?" Fuyumi mused.

Doctor Natsuo shrugged. "It seems to be his sincere passion in life. Enji doesn't have a quirk, so I don't think he was ever planning to become a hero. Legend says that Enji fought off the HPSC to recruit Keigo because his quirk lets him serve and make coffee simultaneously."

"Dad's always been…determined," Fuyumi sighed.

"Obsessive," Shouto said.

"Well, at least he's happy. As happy as he ever gets. He wouldn't know what to do with himself without a goal—or without hating All Might." Fuyumi looked around. "Now how do we save Natsuo?"

"How am I going to get out of here?" Natsuo moaned, kicking the metal wall.

All for One lounged on the sofa. "If you would steal more quirks, then you'd have means to break the wall. But noooo, you keep claiming to have ethics. Even though being a doctor is the perfect opportunity to touch people and swipe their powers."

"I got the All for One ability in this universe?" Natsuo grinned. "Lucky! More abilities would allow me to better help my patients. Oh, and I could take quirks from patients who suffer horrible side-effects."

All for One smiled. "That's what you said when you first went off to medical school."

"That wasn't me. I'm not your son. Can't you see I'm too young to have graduated medical school?" Natsuo waved down at his body.

"Everyone under a hundred looks the same to me." All for One squinted. "Did you get a deaging quirk? Can you become a toddler again? I liked you more as a helpless child."

Natsuo moaned and hit his head against the wall. "I liked you more as a supervillain locked up in Tartarus who had nothing to do with me."

All for One held up a DVD. "Want to play a Demon King video game?"

Natsuo sighed. "Sure, why not? There's nothing else to do inside a bank vault. Besides, it's a little bit nice to have a dad who wants to spend time with me."

Natsuo thought All for One would never leave the vault. Eventually Natsuo had to fake falling asleep on the couch. It turned out there was such a thing as too much fatherly attention. Who would have thought it?

Actually, Natsuo did drift off slightly. He woke up to his doctor self shaking his shoulders.

"Shhhh!" Doctor Natsuo hissed. "I don't know how long I have before my dad returns. He doesn't yet know that I stole a teleportation quirk. As soon as he finds out, he'll prepare countermeasures. We have to leave."

"Can you teleport more than one person?" Natsuo looked up, seeing Fuyumi and Shouto behind his other self. "Never mind, clearly you can."

Fuyumi said, "Shouto was worried we might snap back to the other universe while separated, so he insisted on coming along."

Shouto grinned and waved. "Also, I've never seen a bank vault before. This is neat."

"Grab onto me, we're leaving." Doctor Natsuo rolled up his sleeves and held out his arms. They each latched onto his bare skin.

Just as Doctor Natsuo activated his teleportation ability, a blinding white light covered the four of them. The exact same light as Dabi's explosion.

With a snap and a pop, the four of them found themselves standing on a barren, burned field.

"Shouto was right," Natsuo said in surprise. "It wore off."

"See?" Shouto grinned smugly. "The Illuminati are real, too."

Doctor Natsuo kissed the ground. "YES! I've finally escaped my father! I'm free!" He did a little dance. He was a better dancer than Dabi.

Paling, Fuyumi looked around, "But we left Touya behind…"

"There's nothing we can do," Natsuo said, patting her back.

Shouto nodded. "Big brother might be happier in the other universe. There's no future for him in this one except in jail. This way, he'll be free."

Banging on the walls of the bank vault, Dabi screamed, "Let me out of here! I'm not freaking Natsuo!"

Serenely, All for One said, "You can't trick me with your latest disguise ability, Natsuo."

OMAKE TIME!

Natsuo: I might actually prefer All for One to Endeavor. He's only emotionally abusive not physically, what a prize. At least All for One remembers my name.

All for One: Into the vault, Yoichi junior.

#

Natsuo: No one would notice a unicorn in the modern world.

Eri: That's right.

#

Fuyumi: Funny how Dad is living a happier life without his quirk.

All for One: He wasn't born quirkless, I stole it as a kid.

Fuyumi: Not sure how Hawks got dragged into this mess.

Hawks: Listen, Endeavor might be a gruff boss but he's miles better than the HPSC. Also I love coffee.

#

Natsuo: Mom, you've got shitty taste in men no matter the universe.

Rei: A nice bank vault beats the mental hospital.

#

Shouto: At least Dabi will be free.

Dabi: …

Shouto: Uh, at least you get to be the center of a father's attention?

Author's Note: Thank you to Antique Owl for this cracky idea and Makeshift Moth for brainstorming. I just keep bullying the Todoroki family in this series. Hey, at least it was only Natsuo this time. I thought he should have a Dad for One fic focused more on him, since all his other siblings got a spotlight. Not that I expect him to thank me.