I'll start.

 

Miza was happy. He was gonna help his nation. He had passed the army acceptance test with flying colors. Toph said to him before leaving "Come back, you hear?. I don't wanna have to teach someone else metalbending if you die." He smiled.

"?" Ethan got a letter from a hawk

"..." He read the letter. ran over to his mom and dad and yelled

"HEY MOM AND DAD, I'M GONNA GO SAVE THE WORLD WITH TAKUYA!" He screamed

"MAKE SURE TO COME BACK SAFE ALRIGHT!" His mom said

Ethan got his headband and equipment and jumped through the roofs of the houses and caught up with takuya

"Alright, So we are here to save the good fire nation hmm"

"Wow, you got here fast, and thats not our priority right now, the good has been takin over, and we just have to make sure that they dont take over the other Nations like they tried Years ago, we are going to need all the help we can have, we will need someone who can come up with good plans, we must make an Army, we cant take this lightly, because if we charge in there right now, we could end up being their prisoners too"

Mizuki was sitting outside. A hawk landed on her head. A messenger hawk, she thought. She took the letter and started reading it. Her eyes widened and she ran inside

"Here is what I want you to do Ethan, since you are really fast, tell all of our friends, Bender, and warriors, that we need to build this Army, tell then to ask they're bending friends and warriors that we need them, history must not repeat itself."

"Right!"

Ethan jumped up to the roofs of the houses once again and shouted in his friend's windows

"Hey! We are recruiting you guys! We need to stop the fire nation from taking over again! Let's not have history repeat again!"

He kept jumping and running...

After all the running he slides down a water drain from the corner of a home but later loses his grip

"WAAAH!"

He crashes into a man's cabbage cart

:MY CABBAGES!!" The man said

Ethan got up and ran back to where he first left Takuya

"SORRY!" He yelled

"YOUR GOING TO PAY FOR THIS DESTRUCTION!" He yelled

"Thanks Ethan, that means alot, hopefully everyone Accepts, if not, we might have to do this on our own, and it wont be easy"

Takuya nods, and hopes everyone will be in this.

Takuya, has been hiding in a shelter close to his home to make sure no one see's him.

Miza looked at his fellow soldiers. They were on the camp, getting ready to head to Tiger Island, where some evil earth nation soldiers were rumored to be hiding. Miza sighed. This was going to be violent.

"The next day, I will check out whats going on, I need to see if they have a weekness."

Miza arrived at the island. He heard an alarm, and saw several enemy soldiers running towards him. He put his body in a defensive position, and got ready to fight.

The next day, Mizuki got out of bed and walked outside. There was couple of bad fire nation soldiers coming in her direction. "Crap....." she mummbles and she sends a huge wave at them

Miza looked around. One soldier yelled, "Get ready. Bend an earth wall over here!" Miza created several walls. He then walked to the back of the enemy compound. He broke the metal, and jumped down. He got ready for a fight.