Chapter 1: Help from another world

Disclaimer: I do not own Avatar the Last Airbender nor do I own My Hero Academia. I just like the two franchises and thought that it would be a fun little idea to have the characters from both universes interact. Thank you and Enjoy!

Once, in a time long past, the four nations lived together in harmony, but that soon changed when the fire nation attacked. This attack caused order to be replaced by chaos, and peace to be replaced by fear. The only one who was able to restore balance to the world was the avatar, master of all four elements - water, earth, fire, and air. But even as the avatar began his quest, the spirits of past avatars thought it necessary to send heroes from other worlds to help aid the avatar. And so, the spirits decided to look for warriors who were worthy enough to help the avatar restore balance to the world.

Izuku Midoriya yawned as he slowly awoke to the brightness of the morning sun that effortlessly shinned through the curtains. He sat up in his bed and stretched, raising his arms high above his head. He smacked his lips and groaned as he got up and walked to the bathroom. The morning was just like any other morning he had - it was simply routine. He got dressed, ate breakfast, brushed his teeth, and headed out the door. Izuku was just like any other kid his age; he liked to play with his friends, loved video games, and had super powers. Actually, having superpowers wasn't that uncommon; in fact more that 80% of people in the world had superpowers - or a "quirk" as it's generally called.

Izuku even went to a school that taught kids like him how to properly Control and use their quirks for good, in fact that's where he was headed. Once he got to school, he sat through his classes (board out of his mind as usual), then quickly headed to practice. Practice was held in a large room that was meant for students to work on their skills and perfect their quirks. As Izuku walked into the room, he was soon encountered by two of his classmates - Katsuki Bakugo and Shouto Todoroki.

"Hey! Midoriya! The teacher said that I need to spar someone, so I want you to fight me!" Katsuki yelled as he stomped over to Izuku. "As do I." Shouto stated.

"Huh?" Izuku asked, genuinely confused, "Why me?" Katsuki let out a low growl, "Because everyone else here is too scared to face me, except for this guy", he continued as he pointed to Shouto, who shrugged, "and even he refuses to give it his all!" Shouto sighed, "Why would I fight you with my all if it's just for practice?" This prompted Katsuki to turn to him, "Screw you!", he yelled. Izuku began to laugh nervously as he watched the two teenage heroes argue. Suddenly, out of nowhere, a bright blue light appeared in the middle of the practice room, causing everyone to stop what they were doing and look at it.

The blue light then began to shape itself into an orb that silently drifted over to the three heroes and stopped directly in front of them. Izuku continued to stare at it as the light within the orb got brighter and brighter, then there was a flash and everything in the room was covered with the light. After a couple seconds, the light died down, revealing three missing teenage heroes. Izuku Midoriya, Shouto Todoroki, and Katsuki Bakugo were all gone.

The last thing they saw was light as it was immediately replaced by darkness. The three teens looked around, finding themselves in a small candle-lit room. Suddenly they heard a voice behind them, "Please, be calm. I understand your confusion, but there is no cause for alarm." All three of them turned to find an old-looking man sitting on the floor behind them with his legs neatly crossed. "Have a seat, please." The man calmly instructed. "W-who are you?", Izuku asked, being the first one to speak. The man gently smiled and gave a slight bow. "I am the one who brought you all here."

Katsuki gritted his teeth as he angrily began to approach the man, "Are you telling me this is all your doing?! What the hell do you want?!" The man maintained a calm demeanor as he slowly replied to the young man's hotheaded question, "Do not worry, all will soon be revealed." He said as he gestured to the ground in front of him, "If you will simply take a seat, I shall tell you everything." The teenagers looked at each other before they carefully sat down on the floor in front of the old man. Izuku kept his eyes on the figure before him, trying to decide whether or not he posed a threat.

Once all three of them were seated, the old man began to speak, "Once, in a time long past, there lived four nations that lived together in harmony - the fire nation, the earth nation, the water tribe, and the air nomads. Each of these nations had ancient forms of martial arts called 'bending' that allowed certain users to control the element of their respective nation. There was peace that existed between these nations, but that soon changed when the fire nation desired more power over the other nations. The fire nation decided to attack its fellow benders and throw the political and spiritual force out of balance. The only one who was able to restore balance to the world was the avatar, master of all four elements - water, earth, fire, and air. But now I fear that even he cannot do it alone. That is the reason I brought you all here - I hereby humbly ask of you to aid the avatar in bringing peace to this world."

Izuku stared at the man with a shocked and somewhat confused expression as he tried to piece together what he just heard. There was silence that hung in the air for what seemed like minutes before Shouto was the one who broke it, "So, in summarization, you require our assistance to help this 'avatar' restore balance to the world?" The old man hung his head in an almost ashamed manner, "Yes. Please forgive me, for I know how difficult it is to trust a man whom you've just met. But the fact still remains that this world needs your help. I will not force you to comply, I simply want you to understand." Izuku was slightly taken aback by the old man's humility; in a certain way, it reminded him of All Might.

"Hell NO!" Yelled Katsuki as he practically jumped up from his spot, "There is no way in hell i'm going on some bullshit quest!" He quickly got up and walked off. "Hey! Where are you going?!" Asked Izuku. "Where the hell do you think, genius?! HOME!", replied Katsuki as he reached for a nearby door. He quickly opened it and looked out. His face froze at what he saw; they were in space (or something like it). He saw giant planets situated in various locations with a few asteroids slowly floating around. Beyond the planets (and in fact everything else) there was a sea of stars that beautifully painted the distant cosmos. Katsuki was soon joined by Izuku and Shouto as the three of them stared out in wonder.

Noticing their confusion, the old man began to explain, "Do not fear. It is not real; merely an illusion designed so that those who aren't spirits can perceive a physical environment." Shouto turned to look at the man, still awestruck by what he had just seen, "If that's not real, then where are we?" The old man cracked a small smile, "You are in the spirit world." It was Izuku's turn next as he faced the man, "So then…..who are you?" The old man bowed his head again, "My name is avatar Roku. It is a pleasure to meet you all."

End of Chapter 1

Author's note: It has been soooooooooooo long since I last uploaded anything, and y'know what? - it feels great. I basically started writing this story just after I had finished watching the latest episode of My Hero Academia and a few past episodes of avatar. I honestly first only wanted Shouto to meet Zuko because the two are just so similar (I even think that Shouto was kind of based on Zuko or something. Well, whatever!) Anyway, I hope you enjoyed the first chapter and I will try my best to upload more. Thanks and Peace!