When they got back to the republic Aang went and talked to the avatars.
"How did it go?" asked Roku.
"It went fine. I do feel awful about being the avatar instead of Korra but she thinks it's better if I took over." said Aang.
"We know Aang, but she's right." he said back.
After he talked to him he went to bed. The next day Aang went to see his kids and grandchild.
"Hey guys, how have you been?" he asked.
"Not bad, surprised but good. You?" said Tenzin.
"Not bad feel's weird to be back and twelve again. I do feel awful for switching with Korra." he said.
"She is a bit upset but knows it's better if you were the avatar again." said Kya.
Aang opened his mouth to say something when Jinora ran over to him.
"GRANDPA! GRANDPA!" she yelled.
She ran and hug him tight.
"Ooff!" he said when he fell.
'I guess everyone missed me.' he thought.
"Hi Jinora, what are you doing?"
She smiled and said, "Working on my airbending. Wanna see it?"
"She's doing really good dad." said Tenzin.
"Sure why not. Let's go." he said.
So they went outside so she could show him. When they got to a good place she showed him everything she learned.
"What do you think? How am I doing?" she asked him.
"Not bad." he said smiling.
"Will you show me your airbending? Please grandpa?"
"Sure." he said smiling.
So he showed her everything he could do. She stared at him with wide eyes.
"Wow." she said.
He shrugged. "Hey, I worked hard. Had a great mentor and everything. Monk Giutso was the greatest airbender in the world at my time. And there are days I wonder if they gave me him because I'm the avatar. It feels so weird saying that again and talking to Roku the way I used to." Aang said.
"Why?" Jinora asked.
"Because I thought I was done being the avatar, not coming back and switching places with Korra." he said playing with Jinora in the air.
She laughed, "Grandpa, why did you come back?"
"I came back to fix everything. When an avatar dies it can help the next avatar. When I was the avatar, Roku helped me out and took my body so he could use his bending once."
Jinora was a little confused.
"Since I already have everything mastered and can take over her body I don't need to remaster everything or lose Raava." he said trying to explain.
"Oh, is it hard to learn all of them?"
He smiled.
"It's not very easy. Especially if it's your opposite element. For me and Yangchen it was earth because we were airbenders, Koruk had trouble with fire because he was a waterbender, Kioshi it was air because she was an earthbender, and Roku had trouble with water because he was fire. When you have to learn the opposite you have trouble because you're the best with the element you come from."
"Usually it takes an avatar years to master everything but I only had until the summer to get the elements done, the Avatar State, go to the North Pole, Earth center, and the Fire Nation.
I learned Air in the Southern Air Temple, where I mastered it when I was ten. Water I had Katara and someone called Paku help me with that but it was mostly Katara. Earth I thought was supposed to be my old friend Bumi but he said it was someone else. It was Toph, she's blind and why I can earthbend with and without sight, and mettle bend. Fire we were all surprised it was supposed to be Zuko. He can firebend and use lightningredirection.
"His uncle Iroh created by studying waterbenders."
"He also taught me lightningbending. His uncle, Azula and Ozai could do that, his uncle tried to teach him but he couldn't do it. He wanted to try and teach it to me since it's part of fire and after explaining and showing me what I have to do I got it. To thank him for teaching me how to do all three I tried to help him get it and after a few tries he got it."
"Energybending I was taught by a lionturtle and is how I defeated Ozai. The Avatar State was really hard to learn. The first try I got it I was hit by Azula with lightning which killed me. But thanks to Katara using some Spirit Water Paku gave her worked and saved me. It took me until my fight with Ozai to get it back because I hit my back in the right spot which also got me to master it."
"There are two different types of the Avatar State, one is where I stay in it to have a lot of help, and another to just get a little help by having me shine for a second and then getting back my normal face. To start taking over when I got back I stayed in it. When I had to clean up a bit I used it for a second and then got my normal eyes and cleaned up."
"That couldn't be very easy." she said.
"No, it wasn't. But I did it, got the right teachers and friends to do it. As for Tenzin, he could've been a tiny bit better but after a while he got it."
"AANG! COME HERE QUICK!" yelled Sokka.
"What is it?" he asked.
"We need you to come to the Republic, Azula is fighting Katara!" he said.
Aang ran with him to see Azula using firebending and fighting with Katara. He flew over and airbended Katara out the way so he could take it. The only person that could actually get her was Aang or Zuko because it's hard for water to fight fire.
As soon as he got there he used earthbending and caught the fire. He had his own water carrier now so he could use his own. When he got rid of the air he was on the ground, Azula was surprised but smiled dark.
"Well well well, look who we have here. I thought you were done being the avatar." she said.
"So did I but I guess I'm back. Now what do you want and why are you here? I would think you're a bit too old to do that." he said.
"I just wanted to visit but got into a fight with Katara." she said.
"Well, leave her alone and go back to where you live." he snapped.
"Why? I like it here." she smiled and out of nowhere used lightningbending.
Aang caught it and used lightningredirection then shot it in the air. Then fell to his knees for a second. A few seconds later he was back standing up. He used earth and tried to cover her hands but she moved before he got her. She firebended and got his shoulder which he winced but ignored it. He picked her up with airbending and made her fall.
"Looks like someone is a fully trained avatar this time." she said.
"How else would I be? I finished everything years ago. Do you think I would have to do it again?!" he snapped.
Everyone was amazed to see what he can do this young except his friends. He shot his own fire and made a circle with it around her. She tried to get his face with fire and aimed him with lightning. Aang rolled over because he didn't have time to stop it. He took a deep breath and thought for a second. So he took out his hand and used his own lightningbending.
She moved and just barely made it. When she was on the ground he used his advantech to use earthbending and trap her arms and legs. Then he walked over to her.
"If you ever come back again, you lose your fire bending just like Ozai." he said.
She stared at him for a second and nodded. Then he let her go. After she left Aang fell and covered his shoulder. Some people were surprised at what he could do so young.
He went over and asked Katara if she could take care of what he had on his shoulder. After she did that he went and sat down because he was a little tired after fighting her. He wasn't used to fighting this young anymore so he was a bit tired.
"Wow, I've heard he can fight hard but I didn't know that hard!" said Jinora.
"Yep, he's one strong young avatar." said Zuko smiling.