Similarly for what I did for "Antihero", I will be answering comments from Fanfiction in the author's notes at the beginning of each chapter.

First, to pedrojunior0922. The answer to your question is yes. However, I will not be stating what the question was to kind of keep the surprise for new readers. Kazumi's parentage is the same here as it was in "Antihero", save for her not being adopted by All For One.

Next, to ElephantBoy00, thank you. I was going for adorable.

And third, to sayumiko0. Yes, Izuku is still Quirkless. The storyline is going to follow that of canon with Kazumi taking Mineta's place in class 1-A. I really hate Mineta and I never do anything with him so BYE, pervert!

Now to emiya-excalibur (a little late this time but I love you anyway), thank you for thinking this is cute.

And finally, to The Keeper of Worlds: I'm glad you approve of the ship. I do, too, which is why it will happen eventually. We've got to get them to that point first.

On with the story!

Very quickly, Inko realized something about her adopted daughter.

Kazumi had frequent nightmares.

Often during the night, Izuku would come and wake their mother up, saying that Kazumi needed help because she was scared. And Inko would go and help her without issue. She never pushed Kazumi to tell her the reason, but one night Kazumi asked her something after she'd been soothed.

"Mama, you love me, right?" she whispered.

"Yes I do."

"And I love you, too!" Izuku added, smiling.

"And you're not gonna get tired of me and leave me, right?"

"Of course not! Where did you get that idea?" Kazumi sniffed.

"The papa and mama I was born to didn't want me. They left me on a street corner. I keep thinking you're going to abandon me too."

"I would never do that to you, Kazumi. And I know Izuku won't abandon you, either. You're a very beautiful and smart little girl who just got a bad set of birth parents. But you got lucky and found a loving mama and brother to help take care of you and be there for you when you need them."

"Promise?"

"I promise."

"I promise!" echoed Izuku.

"Now, off to bed, both of you."

"Night, Mama!" the two chorused, giggling madly.

Kazumi was tagging along with Izuku and Kacchan and the other neighborhood boys as they explored a forested area. Kazumi had a backpack on, carrying snacks and water and a first-aid kit that Inko had taught her how to use in case something happened. The sight of her carrying said backpack was fairly common in the neighborhood and it was the only reason Kacchan and the other boys let her hang out with them. That and she was the only girl in the neighborhood who preferred boys' games to that of the other girls.

"Forward march and here we go!" called Kacchan, firing off small sparks as they went across a fallen tree. "Members of the agency Bakugo! Sound—"

He placed one foot wrong and fell into the water below them, making all the other kids look on in worry. Izuku ran down to check on him while Kazumi just followed her brother. She wore a light green T-shirt under a set of overalls with a pair of red sneakers to match Izuku's, her hair tied back in pigtails that flew behind her as she ran.

"Are you all right?" Izuku asked, extending a hand as he waded up to Kacchan. "Are you hurt? I thought you might've hit your head or something."

Instead of accepting the helping hand, Kacchan slapped it away, making Kazumi gasp.

"I don't need your help!" Kacchan got to his feet only to be smacked back by a wave of water. He looked to see Kazumi wading into the water.

"He was only being nice!" she snapped, throwing her hand as if she was slapping Kacchan. And she was, only with water instead of her hand.

"No fair, Water Witch!" Izuku ran and stood beside his sister. "Besides, you're only defending him because he's a Quirkless loser!"

"No I'm not! He's my brother and it's my job to help him! Plus, you're such a jerk!"

The other three boys gasped and ran down to the shore of the small river to see what was about to happen. Nobody insulted Kacchan and got away with it.

"How about you prove how strong you are, then, Water Witch?"

"Bring it on!"

"Um, Kacchan? Kazumi?" spoke up Izuku. "Maybe we shouldn't, um… fight…?"

"Yeah." Kazumi nodded. "Izuku and I are gonna play without you!" She turned around. "C'mon, Izuku!"

The two got out of the water and headed back onto the fallen tree, where Kacchan sent a small explosion to almost set Kazumi's shoe on fire. She screamed as she lost her footing, but Izuku grabbed her hand before she could fall like Kacchan had. He was strong for their age, pulling his sister back onto the fallen tree and then helping her to her feet.

"Thanks, Zuku," she breathed.

"It's no problem, Zumi." They headed back the way they'd come, Kacchan yelling insults after the two that they ignored.

"You know, Zuku, you're gonna make a great hero once you get your Quirk!"

"You think so?"

"I know so! You saved me from falling without another thought!" She grinned. "Izuku and Kazumi, the top heroes in Japan and a team for life!"

"Yeah! We'll be unstoppable!" They pumped their fists into the air.

"It's not gonna happen, kid."

Izuku stared at the doctor with tears in his eyes as Kazumi glared at the man and Inko looked concerned.

"See, we've discovered something. There's a slight difference in the toe joints of those who have Quirks and those who don't." He pulled out two X-rays—both were of toes and one had extra joints. "This right here is your son's toe joints. Quirkless people have those second joints and we believe it's how you can differentiate between the two. This other one is your daughter's. She doesn't have the second joint, hence why she has a Quirk."

Izuku started to cry as his sister hugged him and Inko explained her and her husband's Quirks. When asked how her daughter had a Quirk that wasn't related to telekinesis or breathing fire, she simply replied with 'my daughter is adopted but no less my child than Izuku is'.

On the way home, Izuku was silent, clutching his All-Might figure and leaning against his sister. Inko was just as quiet, silently blaming herself for Izuku's situation.

And then the two female Midoriyas found Izuku watching the All-Might video with tears in his eyes.

"I… I can be a hero too, right?" he asked, his voice croaking.

"I'm sorry, Izuku—" started Inko, but she was cut off by Kazumi.

"Of course you can be a hero, Zuku!" the little girl assured him. "You're smart and strong and brave! All things a hero needs to be! And if people can't see that, then they're big dummies!"

"Thanks, Kazumi." By the tone of his voice, Inko could tell he wasn't quite convinced.

And the fact that the teasing only got worse didn't help. Kacchan and the other boys mocked Izuku relentlessly for being Quirkless, for being useless, for needing his sister to help in his battles when Quirks got involved. But Izuku was fine with Kazumi doing the fighting; she was more hot-tempered and suited for it. No, he was upset because Kacchan was right. He couldn't fight his own battles when it came to Quirks and that was why he was okay with Kazumi defending him.

Of course, it all came to a head in middle school.

"What happened?!"

Kazumi ran over as Bakugo backed away from Izuku with a shocked and terrified look. Her brother was cradling his hand with a pained expression, hiding it from her view. She let out a huff of frustration as she crouched beside him and took his wrist in her hand, taking care not to jostle it too much as she surveyed the damage. What she saw was horrifying and something that had been bound to happen eventually with how often the two boys came into conflict.

Burns.

Kacchan burned Izuku.

"What. Happened. To. My. Brother?" she asked Kacchan, sending him a cold look as she stated each word emphatically.

"Don't look at me, Water Witch—" Bakugo started to snap before she cut him off.

"You're the only person who could've done this!" she yelled. "Nobody else in our school can make any kind of fire!"

A small crowd had gathered when the burn had happened, and one of the boys' whispers had caught her attention.

"Kazumi's not going to like this."

And now? Now she was pissed at Bakugo, but she was more concerned with Izuku.

Use cold water on a burn.

Inko's first-aid training from all those years ago rang in her head and she turned her hands to water as she put Izuku's between them. Kacchan yelled for her to pay attention to him but his voice was background noise to her as she focused on her task and let out a breath.

Soothe the burn. Soothe the burn…

The water turned colder as she tried to do just that and Izuku could feel his skin cooling down. The injury was still there, but it wasn't as painful anymore. Kazumi could control the temperature of her water… kind of. He wasn't sure if she could heat it up yet but if she could make it colder, maybe she could make it hotter too.

"Hey! Water Witch!" She helped her brother to his feet, then turned towards the cause of the injury.

If looks could kill…

"Kacchan," she stated, balling her hands into fists. "I'm going to take my brother to the nurse and then you and I are going to settle this once and for all tomorrow, after school, at the park we went to as kids."

"You're challenging me?" He looked… amused?

"What, do you think I can't handle what you can dish out?"

"Nah. I just don't wanna make your brother watch me kick your ass."

Kazumi's hair started to steam, like it always did when she was angry. And that confirmed it for Izuku. Kazumi could definitely control the temperature of her water. It was just a matter of her learning to do it intentionally rather than by circumstance. She set down her backpack and pulled out some burn cream and bandages, which she used to quickly dress her brother's wound. Once that was done, Izuku made sure to step out of the way as his sister narrowed her eyes at Kacchan.

"Actually, how about we settle this now?" Her voice chilled those gathered to the bone. Izuku scrambled to get out his notebook and make a new notation on Kazumi's page.

"I like the sound of that!" Explosions popped up from Kacchan's hands as he prepared to fight her.

"Fight! Fight! Fight! Fight!" the other students chanted.

Kacchan threw the first attack, which Kazumi dodged with ease. He followed it up with a volley that was nearly impossible to avoid… had she not been made of water. She disappeared as they hit where she'd been standing.

"Where'd you go?!" he yelled.

Suddenly, he was forced backwards by a jet of water and looked to see Kazumi's top half sticking out of a puddle in the ground.

"Whoa…" one of the boys in the crowd breathed in awe.

"That's cheating, Water Witch!"

"It's part of my Quirk, asshole!"

She threw another blast of water, this one more intense, as she surged forward. Her bottom half emerged from the puddle, making her whole again.

"You're dead!" He rushed towards her, hands sparking, before a whistle blew and got their attention.

"Mr. Bakugo! Miss Midoriya!" yelled their homeroom teacher. "Guidance office, now!"

"Fine!" Kacchan spat on the ground as he passed Kazumi, then lowered his voice. "This isn't over, Water Witch. You and me—we're rivals now. You better watch your back or I'll kill you."

"I'd like to see you try."

Izuku followed his sister into the building, a little in awe of what she'd done.

Kazumi Midoriya, my Plus-Ultra awesome sister.

Quirk: Waterworks.

Her body is made entirely of water and she has hydrokinesis, meaning she can manipulate water around her as well. Because her body is made of water, she can turn into a puddle as an evasive maneuver. She can also regulate the temperature of the water she uses, though this ability seems limited at the moment.

Weak to cold weather and electricity due to water body.

Izuku sighed as he looked at Kazumi's page. All of this information had been gathered over the near-decade she'd been his sister and some of it had been as shocking to her as it was to him. No pun intended on her weaknesses.

Her weakness against electricity had been made obvious when they were in elementary school and they'd been walking home together. A villain with an electricity Quirk had been attacking downtown and though his attacks did little more than stun most people (like about a dozen other people, Izuku had been hit by a massive blast that had made him freeze for a few seconds and left his hair standing on end) but with Kazumi, it was a different story. Water conducted electricity and Kazumi didn't have much insulation to keep her body from reacting, so she'd been sent to the ground.

She'd been hospitalized for a week and had sustained the worst injuries out of anybody during that attack. Even after that, when she'd been allowed to go home, she accidentally shocked Izuku with static electricity for a few days whenever she touched him.

As for cold weather, well… water freezes.

The first time she'd turned into a puddle had been an accident, too. While playing dodgeball in PE, she'd been the last one on their team left standing and as a result the other team had targeted her. She was faced with a volley much like the one Kacchan had thrown at her earlier that day and she'd melted before their eyes into a puddle of water on the ground. And rather than punish her for using her Quirk, the teachers praised her for discovering a new aspect of it. That didn't happen every day by accident and Izuku had been so impressed by the fact that Kazumi just shrugged it off like it was nothing.

My sister's amazing. And me… I'm a nobody.

Suddenly, something flicked the side of his head.

"You're thinking about being Quirkless again, aren't you?" Kazumi asked, sitting down beside him.

"Yeah. Kind of hard not to, honestly."

"Well, it's like I said when we were kids. You can be a hero without a big flashy Quirk like mine and Kacchan's. You just have to work a little harder."

"Mom's more of a hero than I am."

"How so?"

"She rescued you off the street where you were picking pockets." She giggled.

"I stole her wallet that day."

"Yeah, I know. She still swears you took a few hundred yen, too."

"Maybe I did and maybe I didn't. I'm still grateful she decided to take me in." She sighed. "Because of her, I have a chance to go to UA—"

"You're not going to UA, Water Witch."

"Kacchan!" gasped Izuku. Kazumi glared at the blonde.

"Who says I'm not going?"

"I do. Because I'm going and I don't need you screwing it up for me! You got that?"

"I'm still going."

"No you're not."

"Who's gonna be your rival if I don't go to UA?" Kacchan opened and closed his mouth, not being able to respond to that. Then he whirled around and left."

"Kazumi, you're way cooler than I am."

"No I'm not. I'm just… lucky. That's all it is with a Quirk—luck. It's like throwing dice; you can hope for one outcome but more than likely you're not going to get it."

"I guess."

"Don't worry. You'll get into UA too. They'd be stupid not to accept you."

"But I don't have a Quirk."

"Fuck that."

"KAZUMI!"

"What? You're always putting yourself down because you don't have a Quirk, but you've got every quality of a hero that you need other than that one tiny genetic detail. So I say fuck not having a Quirk."

"Kacchan's rubbing off on you."

"Ew. Gross. How do I get him to stop?"

"You can't."

"Dammit. Who knows, though? Maybe a miracle will happen and you'll get a Quirk somehow."

"Ha. Right."

At the time, I brushed off Kazumi's comment as wishful thinking. But now I think she was trying to keep my spirits up because I wasn't happy too much anymore. Besides, a miracle did happen.

I got a Quirk.

And Kazumi didn't even know until the day of the entrance exam.

So, yeah. From here, things pretty much play out like they do in canon. Izuku trains with All-Might for ten months to inherit One For All while Kazumi prepares for the entrance exam. Next time will be their entrance exam where Izuku goes all One-Punch on a giant robot.

So long and thanks for all the fish!