Disclaimer: I don't own Harry Potter, Naruto, Ouran High School Host Club (where I got Satoshi), or anything else from which I might end up bringing a character over from.

Summary: When Hayden Potter turns seven, she receives a letter from a school that teaches the Lost Shinobi (Ninja) Arts, including a scholarship that gives her information on her family. As Hayden accepts the offer in the hopes of finding somewhere that she can call home, she is brought into the hidden world of the Elemental Nations, the former countries now being allied and forming the academy. Hayden is made aware of her magical heritage on top of her ninja heritage, and Hogwarts will get a few interesting surprises when she reenters the magical world as a full-fledged ninja.

Note: I don't want to write a whole bunch of chapters as Hayden grows up, so I'll write fewer chapters with scenes from the years as they're passing by. That way you still get detail about what's happening, but you won't have to wait forever for the HP part of the story (the Tournament when she's fourteen) to come.

Warnings: Blaise x Hayden, female Harry, female Naruto, SasuNaru, spoilers, Uzumaki Lily and Hayden, some angst, some bashing (Dumbledore and the Dursleys for sure, haven't decided on everyone else), possible yaoi or yuri pairings at some point…I think that's it. Sorry if I missed anything.

Enjoy!

Hayden's eyes narrowed as she stared at the wooden target dummy a few meters in front of her.

Focusing as hard as she could, she adjusted her grip on her shuriken and swung her arm forward, letting the projectile weapon fly.

Right in the center of its forehead.

Lethal, and with the added bonus of it being therapeutic, since her parents had pulled her aside and told her about what Hinata-chan had found in her scar during her physical exam.

Still, the seal that her adopted mother/cousin had placed on her didn't have any side effects so far. She wasn't possessed or speaking in tongues.

Well, except when she mangled the Japanese words, as she was still learning it, but that was different!

"Good job Hayden!" Iruka called, pleased at the girl's progress.

He would've commented that it looked like she might be the Kunoichi of the Year when she graduated, but that hadn't been a very good decision with the girl's adopted father.

No, it had just made Sasuke's arrogance even worse. And it had made Naruto envious of the respect others had for him, while she herself had been ignored and insulted constantly.

The two in question had gotten over it a long time ago, and honestly he doubted that the sweet, albeit cheeky (once she became comfortable around you) girl would become like that, but better safe than sorry.

Besides, he didn't want to discourage his other students.

"Satoshi-niichan!" Hayden hollered as she came home from school, leaving her bag beside the dining room table. "Sarada-neechan!"

"What's wrong, imōto?" Sarada asked with a frown, coming down the stairs. Satoshi emerged from the kitchen, munching on an onigiri with some red hot sauce poured onto it.

Hayden had learned that all of the members of her new family had food obsessions. Her mom loved red bean soup and was utterly obsessed with ramen, her dad preferred tomatoes and onigiri, Sarada never left home without a bag of saltwater taffy (unlike her dad, who hated sweets), and Satoshi carried a bottle of hot sauce on him everywhere he went in case his food needed a little 'kick.'

The little girl had decided that it was only a matter of time before she developed her own.

"I was wondering if you two could help me with my chakra control." Hayden admitted sheepishly, bringing herself out of her thoughts. She lunged forward and pinched off a small portion of her brother's snack, putting the sticky rice in her mouth before he could protest.

Sarada's dark eyes glinted in amusement as her twin pouted at their little sister.

She was just glad that Hayden was comfortable enough around them to do something like that, and she knew that Satoshi felt the same and didn't really mind.

"Of course." The older girl agreed. "What are you working on right now?"

"The leaf exercise." the seven year old pouted. "I can meditate just fine, and I'm regulating my chakra, but…"

"But you're an Uzumaki like Sarada, mom, and I." Satoshi finished. "You might be able to keep the flow steady, but there's still too much chakra flowing to be able to do the exercise correctly."

Hayden nodded with a pout, but was glad that apparently she wasn't the only one in the family who had had trouble with it.

"Okay." Sarada began, sitting cross-legged on the floor and gesturing for Hayden to do the same. "Satoshi, can you go get a few leaves?"

"We'll start with thirty." He agreed before heading out the front door.

"Mom had more trouble with this than we did, but that's because of the Biju." Sarada explained. "Still, we had issues with chakra control, too. Eventually Satoshi was messing around with a lot of leaves, not just the one, and we figured it out."

"What?" Hayden asked curiously.

"They all stuck to me when I tried it again." Satoshi answered as he reappeared, this time holding a bunch of green leaves in his hand. "The amount of chakra I was using was too much for one leaf, but when there were more leaves to stick to my skin, I could do it."

"So we learned it that way." Sarada continued. "We started out with multiple leaves, and then slowly worked our way down to one."

"It was a huge pain, trying to figure out how to lessen the amount of chakra we were using, but it worked." Satoshi said with a shrug, before handing his younger sister the leaves. "Go ahead, try it."

Hayden accepted the leaves, biting her lips thoughtfully. It using too much chakra was really the issue, then this would hopefully work.

Satoshi and Sarada helped Hayden place some leaves on her arms, and Satoshi gently held one to the girl's forehead (where the academy had them try and place it.)

Hayden closed her eyes, keeping still, and eventually her breathing quieted and evened out as she went into a meditative trance.

The twins could feel the leaves on the girl's arm become surrounded by chakra, and Satoshi let go of the leaf he was holding to her forehead, and Sarada turned her arms over so that the leaves were underneath.

They stayed in place.

Feeling accomplished (after all, now they knew that their little training exercise didn't only work for them), the twins grinned at each other.

They'd get her down to one leaf in no time.

Wouldn't Iruka-sensei be surprised?

"Okay, what have we got?" Naruto clapped her hands together, glancing around the table at her family.

Satoshi bit his lip in thought. "There have been two Dark Lords—or glorified serial killers and terrorist—in England since World War II. The first one, Gellert Grindelwald, apparently controlled Hitler with what's known as the Imperius Curse, which takes away a person's free will and allows the caster to control them."

The others looked appropriately horrified at that.

"One wizard caused the Holocaust?" Sarada asked, pale skin even paler than usual.

"Well, he had followers that obeyed his every whim, but pretty much." Satoshi scowled. "And guess what? That Dumble—whatever guy you mentioned? He's the one who defeated Grindelwald."

Naruto and Sasuke grimaced. Just what the old man needed, more influence.

"And the other one?" Sasuke asked.

Satoshi flinched, glancing at his younger sister. "The other one was Lord Voldemort, though in England they call him You-Know-Who or He-Who-Must-Not-Be-Named."

"That's a lot of words." Hayden commented quietly, eyes sad.

Oh yes, the goblins had made sure to explain to her and her parents exactly how she was connected to the dark wizard.

Besides the soul shard in her forehead, but she supposed they didn't know about that part.

"It will take me more time to make sense of the theory." Sarada spoke up with a slight frown, hoping to distract her sister.

"Fair enough." Naruto agreed, knowing what her daughter was doing. "I tried to read a page of one of those books and I couldn't understand a word of it."

Sarada nodded in agreement. "They are rather…dense and verbose."

Hayden tilted her head curiously, and Sarada explained. "There are a lot of words and the words that the author used are difficult to understand."

Hayden nodded in understanding, appreciating the explanation.

Asking questions had always been forbidden to the Dursleys, and the only time they'd ever explained something to her had been when they were showing her how to complete the long list of complicated chores.

Seeing that Sarada was apparently finished, Hayden spoke up.

"The healing…eh, I like Sakura-chan's version better." She said with a shrug. "Though apparently there's this potion called Skele-grow, which can regrow bones."

Naruto glanced at Sasuke, thinking of Kimimaro, whose Kekkei Genkai, or blood limit, had basically been to grow extra bones and use them as weapons.

"There are a lot of animals from fairy tales and myths that are real." She explained, eyes brightening at the thought. "Unicorns, dragons, vampires, werewolves, mermaids—er, merpeople, centaurs, giants, house elves—which are like slaves (her eyes darkened at the thought), and goblins. Veela, which are kind of like sirens except not in the water. Full Veela can turn into a sort of half bird and shoot fireballs! They also have a sort of…I don't know, Genjutsu, maybe, that helps them seduce men. Oh! And in the wizarding world they use owls to deliver their mail, kind of like the Kage use hawks to announce a meeting."

Well, not really, but they both used birds of prey to send a message.

Naruto and Sasuke's eyebrows shot up at the sudden influx of information.

It was to be expected, of course. Hayden had probably grown up hearing about some of these things, even if she only heard the stories secondhand. It was no surprise that it would fascinate her.

"And…there's these things called Dementors…" Hayden's eyes watered. "They…they take away a person's happy memories and leave them sad and depressed. And they can suck out your soul."

"Hayden?" Sarada asked, alarmed at how her sister had gone from happy and excited to…this.

"They guard the wizard prison, Azkaban!" the seven year old cried out, not protesting as Naruto swept her into a hug. "W-what if Sirius really is innocent? He's surrounded by those things!"

"Oh, sweetie." Naruto whispered. "We're doing everything we can to get him a trial."

And they really were. Unfortunately, they really couldn't do much at the moment, especially with the Ministry blocking them left and right.

After all, they were 'muggles,' and they couldn't risk Hayden using her name to get it done.

Not yet.

"I know." Hayden whispered back.

"Sasuke, what about your topics?" Naruto asked a few minutes later with a sad smile.

"A lot of convoluted bullshit." Sasuke said with a scowl, recalling how England's magical society worked.

"Curse jar." Hayden muttered.

Sasuke grumbled half-heartedly, his wife and kids grinning at him (half-heartedly in Hayden's case) as he got up to put his 'fine' in the aforementioned container.

"Carry on." Naruto said, biting her cheek in an attempt not to laugh at her husband's 'misfortune.'

Sasuke sighed. "The wizarding world in the United Kingdom is full of racism, stupidity, nepotism, bribery, treason, terrorism, corruption, and a plethora of other things on a list that is far too long."

The other four frowned at him.

After all, her birth parents had grown up there, or partially in Lily's case. Had they been like that, too?

"Great." Naruto muttered. "That's going to be fun."

Unfortunately, they all knew that at some point Hayden would need to go back to England, at least for a short period.

With the near worship of her in the history books Satoshi had been studying (and the normally calm and cheerful boy had wanted to punch something when he saw how they just presumed that she was a spoilt brat living in a castle), they knew that their government wouldn't just let her fade into obscurity.

Which went against the traditional ninja way of this world, but honestly, what with their flashy ninjutsu and gigantic boss summons, their version of ninja had never been particularly subtle unless the situation absolutely required it.

Besides, Naruto housed eight huge demons in a seal located on her stomach. How subtle was that?

"Ancient Runes is good to know, I guess, but believe it or not Fūinjutsu is not only easier but also more practical." Naruto sounded a bit disappointed. "Warding could be extremely useful, though. Say, if we ever need somewhere completely safe with no chance of anyone attacking…"

Sasuke's eyes brightened a bit at that and Naruto smiled at him knowingly, though the kids all looked confused.

"As for Herbology…" the blonde twenty-six year old trailed off for a moment, leaving them hanging before she grinned brightly. "Some of those plants are totally awesome! There's this thing called the Venomous Tentacula, which is kind of like a giant Venus Fly Trap, but it targets humans, not bugs, and it can attack you with its vines, too. Devil's Snare can strangle you to death if you're caught in it. Oh, and there's also Gillyweed, which gives you gills and flippers so you can swim and breathe underwater without using a jutsu, and then there's—"

"Naruto," Sasuke interrupted, looking thoroughly amused to the kids, though a lot of people wouldn't be able to tell from his expression. "Breathe. In…and out…"

The blonde woman scowled at him, and he shut his mouth, not wanting to be banished to the couch.

"Mom really likes dangerous things." Satoshi whispered conspiratorially to his sisters.

Hayden snickered and Sarada bit her lip in an attempt to stop her smile.

Thousands of miles away, on a small island covered by a thick shroud of mist, one Sirius Orion Black was shivering in his cell, waiting for the human guards to leave so that he could transform into Padfoot, his trick to combating the Dementors' abilities.

"Rotten bastard." One of the guards sneered as he glanced into Sirius' cell. Sirius didn't dignify the insult with the response, not that the guard was expecting one.

After all, he'd been there for years—what was it, six? Perhaps seven?—and no one else had been able to remain as sane as Sirius had, and it was only because of his status as an unregistered Animagus that he was able to pull it off.

If they had given him a trial, or even interrogated him before throwing him to Hell on Earth, they would have found out about Padfoot, and wards would have been cast around his cell.

Of course, if they'd have given him a trial, he wouldn't be in Azkaban in the first place.

Incompetent morons.

While Sirius blamed himself for James, Lily, and his beautiful goddaughter being attacked, he knew that legally he wouldn't be held accountable for it.

Sirius might've made the suggestion that the Potters switch Secret Keepers, but he didn't know it at the time that Peter—that goddamn rat—was a traitor, nor had he been the one to sell them out.

But no, apparently his guilt was even more certain than his dear cousin Bella's, who he knew damn well had gotten a trial after attacking Frank, Alice, and little Neville.

The worst part about that news wasn't that Bellatrix had gotten a trial when he hadn't, but that he didn't know if the Longbottoms—any of them—were still alive.

Not knowing was far worse.

And where was his goddaughter? The light of his world, little baby Hayden, the most perfect human being on the planet, in his ever-so-humble opinion.

He would curse himself to the end of time for leaving her safety and well-being to Hagrid. The half-giant was trustworthy and certainly wouldn't endanger Hayden on purpose, but…

Well, what most people would might consider 'dangerous' Hagrid considered totally harmless.

Peter wasn't worth the air he breathed, yet Sirius had been stupid enough to put him before Hayden?

God, what the hell had he been thinking?

Sirius could only hope that someday, somehow, Hayden found out the truth and forgave him.

Honestly, though, he didn't think he deserved her forgiveness.

How old would she be now?

The black-haired man glanced at the newspaper that Cornelius Fudge, Minster for Magic (and how in Merlin's name had that happened?), had dropped off a couple of weeks ago.

June 11th, 2008.

His little Hayden would be eight years old in just a few short weeks.

She was growing up, and he wasn't there to see it.

He could only hope, pray to the gods of old that she was safe and happy, wherever she was.

If she wasn't…well.

Gryffindor and Light-oriented as he may be, Sirius was a Black.

And woe betide anyone who earned his wrath.

Please review! :)

Note: Imōto means little sister just as Otouto means little brother.

For comparison's sake, the Japanese school year begins in April, so that first scene with the target practice happened 3 months after school started. While the academy is located in Canada instead of Japan, the Elemental Nations had obvious roots with Japanese culture in various ways, heck ninjas alone are something associated with Japan. Anyway, they'll be following that schedule. Which will make it even more of a pain for Fudge to get them to agree to participate in the Tournament later on, and more favors that they can exploit.