I do not own Familiar of Zero. If I did, I'd give Saito a personality.

I do not own Avatar the Last Airbender. If I did, I'd eternally have pride in the accomplishment of a masterpiece.

Floating.

Darkness.

Light.

Nonexistent.

Void.

Endless.

The soul of Aang lay floating in the in the Abyss. When Korra, the current Avatar, was separated from Raava, the Avatar spirit, all of her previous lives were disconnected from her. Ten thousand years of reincarnated souls layered one on top of another, all connected by their link to Raava's spirit, gone. The loss left the young Avatar crippled spiritually, but with time, she would recover.

But her story is not what matters now.

Aang, the previous reincarnated soul of the Avatar, was the first to break away when the connection was severed. Barring the one hundred years he spent under ice, he lived a relatively short life of sixty-six years. Even almost twenty years after his death, many of his friends and companions had yet to pass on to the spirit world. As Aang found his soul severed from Raava's spirit and his previous and future incarnations, he willed his spirit to assume the Lotus position. It was the stance he found most comfortable for meditation, but instead of keeping his mind empty, he found himself with a few lingering regrets about his actions in life.

He was not too proud to admit that he had not been the best father to his children. His air-bending son and youngest child, Tenzin, had been given the responsibility to rebuild the Air Nomads and preserve their legacy. This burden gave the young man a distorted view of the world; he struggled to adapt to the changes of the future. And the time Aang spent with him was time taken out of his time with his two older children, Bumi, a non-bender, and Kya, a water bender. While Aang may have saved the world and united the four nations—and helped found a fifth one—he had failed in fatherhood.

His failures weren't just limited to his parenting. He had made crucial decisions in political, social, and military atmospheres. Some choices that he made would have a lasting impact that would reach long after his passing. He had lived long enough to see some of his mistakes, but he knew that time would tell if he truly made the right decisions in his lifetime.

Aang did not know how long his spirit stayed in that place. Seconds, days, months, years, none of it mattered. With no concept of time or space, it was an eternity of nothingness. Despite his spiritual discipline, Aang felt his soul erode. Without a presence in the spirit world or any other spiritual tether, his soul would eventually pass on. Whether to be reincarnated without any memories or to disappear entirely, who could say? Neither option would maintain his presence self, so Aang resolved to maintain his soul for as long as he could.

And so, he remained. His soul fading away layer by layer, until it was little more than a core with a fading fragment shell.

Then, for the first time since his passing, he heard a voice.

"My familiar that exists somewhere in the infinite universe!"

Familiar? What's that?

"My divine, beautiful, wise, and powerful servant!"

Aang wasn't sure about the servant part, but he thought he came pretty close to the rest of the criteria. Avatars were close to divine, he had pretty good looks—at least, Katara said so—he grew into a good amount of wisdom, and his power was definitely worth mentioning.

"By the power of the pentagon of five elements, head my call!"

Aside from the four normal elements, spiritual energy manipulation—also known as energy bending—was something Aang practiced. That was another requirement checked off.

"I wish from the bottom of my heart."

A heartfelt plea. One of filled with desperation and tinged with a sliver of hope. Aang couldn't ignore someone in trouble. It didn't matter if he was the Avatar or not. Bending, age, power, they were inconsequential. If someone needed help, Aang would help them, it was as simple as that.

"Appear before me!"

Aang snapped out of his meditative state, willing himself to follow the voice that called out to him. As he reached forward, he felt soul come undone, the spiritual protection he had used on his soul were fraying at the seams.

Soon, he would cease to exist.

But if he could help just one more person, it would be worth it.

He stretched out his hand.

There was light.

And then.

Darkness.

Louise Valliere was not a normal noble girl.

Yes, she came from a noble family. In fact, her mother of Karin of the Heavy Wind, a legendary Square Class mage. Her father was a duke, giving her family very close to ties to the royal family. Louise was used to being waited on hand and foot by servants and maids. She studied and followed the teachings of the Church and the Founder, who professed that the magic gifted to mages were proof of their nobility and authority to rule. Like most Tristan nobles of her age, she was a student of the Tristan Magic Academy. Already into her second year of studies, she was well versed in the theoretical aspects of the four elements of magic.

Yes, Louise had many things that made her seem like a normal noble girl. But what she lacked—aside from a developed female body—was something that defined nobility itself.

Magic.

At the Academy, Louise was infamously known as "Louise the Zero" for her lack of spellcasting ability. That was not to say that nothing happened when she tried to cast a spell. Far from it. In fact, evidence of Louise's attempted castings were painfully obvious across the entire academy grounds. Every time Louise channeled her willpower into her wand to cast a spell, a thunderous boom would erupt with a could of smoke. Even the first-year students had become used to the signature sound of Louise's explosions.

While it was first theorized that the explosions were the result of an improperly cast fire spell, that theory was quickly proven false. The explosions lacked the signature heat and flames that would be present in even a botched fire spell. The smoke came from the spell charcoaling whatever was in its epicenter, and then billowing it out with tremendous force. No matter what element of magic Louise attempted, all produced the same element-less explosion. With no way of categorizing Louise's explosions under any of the four categories, her Explosions were deemed not be "true magic", and thus consistent failures of a spell.

Can a mage that cannot cast a single spell truly be called a mage, and by right, a noble? That was the question on everyone's mind regarding the youngest Valliere daughter. While she had the training and studies to be a noble, without anything that could be called an accomplishment in magic, her legitimacy was constantly called into question. Despite the obvious similarities to her family, there were even rumors that she was a bastard child of a commoner, and she had inherited a commoner's lack of magic by blood.

Louise did not want to bring dishonor to her family. While she kept her head held high during her time in the Academy, she always wished that she was able to cast a spell properly. And with the Familiar Summoning Exam coming up, now would probably be her last chance to prove herself.

The entire class of second-year students stood in a loose circle in one of the academy courtyards. Gossip and whispers flittered through the air. Fidgeting of nervousness and excitement alike ran through the crowd of students who were awaiting the start of the exam.

The sole teacher supervising the exam, Professor Colbert, greeted the class, "Good morning, students. As you all are well aware, it is time for the Springtime Familiar Summoning Exam. And while this is called an exam, do not worry, you will succeed no matter what type of familiar you summon."

"The Founder Brimir created this exam for mages to be able to summon the ideal familiar to match their affinity and personality. All you have to do is follow the instructions, concentrate your willpower, and your familiar will appear before. Remember, a familiar is more than a pet, it is a mage's lifelong companion. Treat your familiar well, because you will need to rely on them at one point in your future. Just like when dealing with people, first impressions are everything." After concluding his speech, the balding man adjusted his spectacles. "Who would like to go first?"

One by one the students came forward. Stepping into the ring of their classmates, they uttered the words of the spell and summoned the creature that would be bonded with them for the rest of their life. Some students summoned mundane creatures, such as a cat or a frog. Others summoned more exotic creatures, such as a Bugbear, a creature consisting of a single floating eye, or a Salamander, a fire breathing reptile. But the most impressive summon was certainly a Wind Dragon. Despite being an adolescent, it was larger than all of the other familiars put together. Ironically, it was summoned by the smallest, but most powerful mage in the entire class.

"Well done, Miss d'Orleans," Colbert praised the blue-haired young mage. "A Wind Dragon is a rare a powerful familiar, well befitting your status as a Triangle Class mage. Now, is that everyone?"

"Louise has yet to summon a familiar," A tall, buxom redhead called out.

"Ah, yes, thank you, Mrs. Zerbst. Miss Valliere, please come up and perform the ritual."

Louise, who had been hanging back while her peers summoned their familiars, slowly stepped forward. She moved with the elegant grace of a noble, but her thoughts were far from it. She was gathering all her willpower, holding onto a firm resolution to improve her chances of success as much as possible. And also, to remove the lingering fear and doubt in her mind. Louise knew that her position as a noble had long been called into question. Already, plans were in motion to marry her off. Granted, her fiancé was a kind, gentle noble, but if Louise failed here, she would only exist as an accessory. She would forever be known as the noble who was not a proper mage. In fact, if it wasn't for the high position of her family and fiancé, she would become a disgraced noble.

But Louise did not want to live by the safety net her family provided her. She wanted to be a mage, a noble in her own right. She had to complete this spell. If there was one spell she needed to cast properly, it was the one to summon a familiar. And perhaps, her familiar would give insight as to what element she was supposed to wield.

Needless to say, this exam was the most important test of Louise's life.

She had everything to gain.

And everything to lose.

Louise took a deep calming breath as she raised her wand. "My familiar that exist somewhere in this vast universe!"

"What kind of spell is that?" asked Montogomery, a blond-haired girl holding a frog.

"Whatever it is, it's original, that's for sure," Guiche, a curly haired blond replied. A large mole nuzzled his calf.

"My divine, beautiful, wise, and powerful servant, by the power of the pentagon of five elements, head my call!"

Tabitha d'Orleans peered over the small book she had been reading for most of the ceremony, curious about the improvised spell.

"I wish and assert from the very bottom of my heart, appear!"

The familiar sound of a large explosion ripped through the Academy grounds. A cloud of ashless smoke seeped through the air.

"Looks like the Zero failed again."

"Maybe an explosion is her familiar! It would fit her attitude."

"No way is she going to be allowed to stay in the academy."

Louise clenched her hands to the side as she peered into the cloud desperately. Hoping, wishing, praying that she had actually managed to summon a familiar, that she would redeem herself in the eyes of her classmates, teachers, and family. But as the cloud started to die away, she could see no figure standing in the magic circle.

She gripped her wand until her knuckles turned white. Keeping her head down, she turned to professor Colbert. "Can I have one more try?" she asked, no, pleaded him.

The bespectacled professor sighed as he shook his head. "The Spring Familiar Summoning Ceremony is a requirement for second years," he said regretfully. "And it appears you are unable to cast the spell properly."

Louise kept her head down, fighting back tears of shame. A Vallerie did not cry, she told herself. As disgraced as she was, she would not bring any more dishonor to her family. She would take her failure—and expected expulsion—with dignity.

"Don't worry," Professor Colbert assured her. "I'm sure that your parents—" His voice cut off abruptly, prompting Louise to raise her eyes and catch her professor's slack-jawed expression. The whispers of her classmates changed from jeering to confusion, with several of them pointing at the thoroughly ruined summoning circle.

Louise slowly turned around, unwilling to get her hopes up. Her eyes widened in surprise when she saw a young boy lying on his back in the center of the circle. His body was covered in ash and dust, but he looked to be about thirteen years old. He wore baggy pants and a shirt that was covered by a short mantle or shawl. In his partially clenched hand lay a simple but well-cut staff. Given that he was lying in the center of where her spell had been cast, Louise would suspect he was dead if it wasn't for the gentle rise and fall of his chest.

Her legs carried her to the boy's side as Louise took a closer look. He was scrawny, and seemed to be sleeping peacefully despite what had just occurred. "Professor?" she asked hesitantly, alternating her gaze between the boy and her professor.

Professor Colbert scratched the side of his head in thought. "Well, it looks like you did someone a familiar after all," he said.

"Louise summoned a commoner boy?"

"Yeah, right, she probably paid him to stand in there and got knocked out in the blast."

Louise bristled, but did not respond to the new, barely whispered rumors. "Does a commoner count as a familiar?" she asked, a sliver of hope entering her voice.

"I suppose it does," Professor Colbert replied. His puzzled gaze glanced over the boy, but he gave a nod to Louise. "Go on now, complete the ceremony."

Louise hesitated as she looked down at the sleeping boy. "You are extremely lucky that I summoned you," she whispered to the sleeping boy as she leaned forward. "Normally, I would never lower myself like this." She closed her eyes as she gave him a quick peck on the lip, sealing the contract.

That's when something unexpected happened.

"He's glowing!" someone yelled.

Louise's eyes snapped open as she looked at her new familiar. Sure enough, an icy blue, almost white, glow illuminated his hands and head. The glow was shaped like an arrow that ran from his forehead over his bald scalp down to somewhere on his back. Similar arrows marked the backs of his hands, with the arrows' trails leading up the long sleeves of his oddly designed shirt. On his left hand, the one not holding the staff, blinding white symbols burned themselves into his skin. As if in response, the glow of the arrow markings intensified, causing several students to shield their eyes to avoid being blinded.

Louise, being the closest to her familiar, was startled by the sudden surge of brightness. She backpedaled away in such a hurry that she ended up tripping over the hem of her robe. She watched with an open mouth as a strong wind circled around her familiar, raising the limp, glowing boy several feet into the air. The winds carried away most of the dirt and grime that covered his body and clothes. His shirt and pants were yellow. An orange sash was tied around his waist, and the short mantle he wore shared that color, along with bindings on the elbows and wrists of his shirt. Brown leggings ran all the way down to his feet, where they ended in darker brown unusual footwear.

But Louise's attention was snapped away from her familiar's unusual appearance as the boy's eyes slowly began to open. Brilliant white light poured out, and with it, a feeling of overwhelming awe overcame her. Those eyes seemed to carry the wisdom and power of someone far older than his body suggested.

"Get back, Miss Valliere!" Professor Colbert shouted. He stepped forward and raised his staff towards the floating familiar. The man had seen many things in his life, but this was the first time he found himself in a presence that seemed to transcend humanity. "Move away to safety!"

Louise couldn't even Colbert over the sound of the rushing wind. She was terrified, but at the same time, fascinated by the appearance of her familiar. As those eyes stared into her, Louise felt overwhelmed, but strangely, at peace. With eyes glazed as if in a trance, she raised her hand towards the body…

Only for the glowing to immediately stop and the boy to crash to the ground.

There was a hush that lasted for several moments, but eventually, the surrounding students managed to catch their breath.

"What was that?"

"How did the Zero use magic like that?"

"That wasn't her, it was her familiar!"

"Is her familiar a mage?"

"No mage glows like that, and his stick isn't even a wand."

"Are you sure?"

"Miss Valliere, are you unharmed?" Professor Colbert asked as he approached. He kept a fraction of his attention focused on the boy, who seemed to be stirring into consciousness.

"I am," she affirmed in a shaky breath. "I was just surprised, that's all."

A groan pulled Louise's attention to the boy she had summoned. He pulled himself up to a sitting position, blinking rapidly as he tried to adjust his eyes to what he was seeing.

Louise stood to her feet and brushed some stray dirt of her robes. Of course, it did nothing to help the fact that her entire outfit would have to be thoroughly washed—one cannot stand next to a windstorm without consequence—but first impressions were everything. "Familiar," she declared. "I am Louise Francoise de Blanc de la Valliere. From today onwards, I will be your master, understood?"

The boy looked at her blankly, then smiled. He opened his mouth as if to speak, then scrunched up his face as his nose wiggled.

"Don't make rude faces at me!" Louise said sternly.

Her familiar's mouth opened wider as he scrunched up his eyes.

"Listen well. I am your master and you will act like the obedient familiar you should be! Do you hear me?"

"ACHOO!"

And that was the second explosion of the morning.

And I'm here with another installment to the Louise Summons series. This time, Louise has summoned our favorite cryo-frozen air nomad boy, Aang!

For those who don't know, I'm making this series because I think the author of Familiar of Zero wasted a lot of the potential his universe and characters had. So, I'm trying out crossovers of a bunch of different people who could be summoned as Louise's familiar, as Saito, the original protagonist, is more of an archetype than a fleshed out character.

Unlike most people summoned in Familiar of Zero crossovers, Aang is dead, and technically counts as a mage. This means he doesn't have much reason to find a way "home", and he's not going to be treated like garbage like most of Louise's summons. I think he'll provide great balance for Louise.

Want to see what other series I'll crossover? Follow me! If you like this story and want to see more, please follow and leave a review too! Remember, reviews are food for a writer's soul!