Sooo, this is an OC story where my character is Katara's twin sister. They aren't identical. If you want a full description please ask and I'll post one and a link to a sketch…. So I don't want to give too much away but this'll follow Sesi on her journey to stop the war.
I own Sesi and any variations in the storyline/plot….
ShellyMay

Avatar the Last Airbender: Sesi's Journey
Chapter One: The Boy in the Iceberg

Water. Earth. Fire. Air. My grandmother used to tell my sister and I stories about the old days, a time of peace when the Avatar kept balance between the Water Tribes, Earth Kingdom, Fire Nation and Air Nomads. But that all changed when the Fire Nation attacked. Only the Avatar mastered all four elements. Only he could stop the ruthless firebenders. But when the world needed him most, he vanished. A hundred years have passed and the Fire Nation is nearing victory in the war. Two years ago, my father and the men of my tribe journeyed to the Earth Kingdom to help fight against the Fire Nation, leaving my brother, my sister and I to look after our tribe. Some people believe that the Avatar was never reborn into the Air Nomads and that the cycle is broken, but my sister and I haven't lost hope. We still believe that somehow the Avatar will return to save the world.

We were out fishing again. Sokka was standing with spear in hand, looking at the water. Katara sat opposite me; as per usual she found Sokka's antics thoroughly boring and was simply staring at the water. "It's not getting away from me this time Katara. This is how you catch a fish."

"Remember Sokka, patience the fish isn't exactly where it seems." I told him echoing what our father had taught us about refraction so many years ago. My brother had never quite grasped the concept unfortunately…

Katara had completely ignored both of us, slipping off one of her gloves. A deep look of concentration washed of her face as she slowly started to move her hand back and forth bending a globe of water up and over Sokka's head, a fish swimming around inside. With delight she called "Sokka, Sesi look!"

"Shhh, Katara you're gonna scare it away. Mmmm…. I can already smell it cookin'!" He whispered to her angrily.

She frowned, I could see her losing control of the sphere and raise my own hand swathed in fingerless gloves to help her steady it just when Sokka raised his spear to strike and burst her water bubble. The fish got away but I managed to keep Sokka from getting drenched with a few quick wrist movements.

"Hey!"

"Why is it that every time you play with magic water I either get soaked or have to get saved by Sesi?" He yelled facing Katara.

"It's not magic. It's waterbending, and it's-"Oh god not this again, I winced internally well aware of where my siblings were taking this.

"Yeah, yeah, an ancient art unique to our culture, blah, blah, blah. I'm just saying that if I had weird powers I'd keep them to myself."

"Sokka, she's not the only one that can waterbend and yet you never call me weird! Besides if you had actually paid any attention to what she was trying to show you, you would've seen that she caught a fish."

"Whatever," He replied sulkily as he sat down, "She's still weird."

"You're calling me weird? I'm not the one who makes muscles at myself (Do you mean flexes?) every time I see my reflection in the water."

I had to stifle a laugh at this because true to form Sokka had his parka sleeve rolled up and was checking out his muscles in his reflection… He looked at her and was probably glaring when the canoe bumped. I looked away from my siblings to see that we were surrounded by chunks of ice. Sokka grabbed the only oar while Katara and I did our best to control the water, screaming as we worked frantically to manoeuvre through the icy obstacles. Katara occasionally yelling things like "Watch out!" or "Go left".

We finally slowed and got to a safer patch of water where we could step onto a large sheet of ice when Katara started yelling at Sokka. "You call that left?"

"You don't like my steering. Well maybe you should have waterbended us out of the ice."

I sighed, used to waiting out their silly arguments. Something was strange though. A huge ice berg towered above us; it was strange, like it was calling out to me.

"So this is my fault?"

Without meaning to I blocked them out moving slowly towards the large iceberg.

"I knew I should have left you at home. Leave it to a girl to screw things up."

"You are the most sexist, immature, nut brained…. Ugh I'm embarrassed to be related to you! Ever since Mum died I've been doing all the work around camp while you and Sesi have been off playing soldier." I finally started pay attention to them when large cracks started to cover the iceberg.

"Uh.. Katara." Apparently Sokka had noticed the cracks too.

"I even wash all the clothes! Have you ever smelt your dirty socks? Let me tell you, NOT PLEASANT!"

"Katara, stop it." I shouted at her. "Stop acting like I do nothing to help, we divvy the chores, and yes I train with Sokka. So what? It doesn't mean you get to throw a tantrum and destroy giant icebergs."

"No that's it, I'm done helping him. From now on he's on his own." She kept yelling. Just as she finished the iceberg split, chunks falling into the water and rocking the ice at our feet.

Once it settled Sokka spoke his voice full of sarcasm. "Okay, you've gone from weird to freakish, Katara."

"You mean I did that?" She asked shocked at how much power she had.

"Yup congratulations." He said looking down at the water.

A blue glow began to permeate from the water and I threw myself to the edge of the ice to peer at it. Suddenly a sphere of ice broke free from the water and pushed our ice raft back about 50 feet forcing Katara and Sokka to lie with me and grip the edge to keep from falling off. The sphere was causing the glow; inside it I could see the outline of a boy and a large creature. I jumped up and started hoping from once chunk of ice to another making my way over to him.

I could hear Sokka and Katara following me and as I got closer I could that the boy looked like he was meditating. Arrows were visible on the back of his fisted hands as well as his bald head. As Katara came up behind me his eyes opened glowing brightly, the arrows started glowing as well. It was a magnificent sight, almost blinding.

"He's alive, we have to help him." Katara yelled at Sokka grabbing his spear off him and running up next to me.

"Katara, Sesi get back here! We don't even know what that thing is!" Sokka yelled as I stepped back and she began whacking the ice. After a few seconds cracks started to web over the ice and it split open, a huge gust of air rushed out of it. It was almost as if there was a cavern or chamber with in. A huge explosion cracked the ice the rest of the way open and a column of the blue-ish light raced into the sky. Sokka pushed both Katara and I back trying to shield both of us from the explosion. Most of the light dissipated quickly with only swirls surrounding what is left of the iceberg. The boy appeared out of nowhere, the glow still emanating from his eyes and arrows. Grabbing his spear Sokka stood facing the boy and shouted. "Stop!"

He stood at the top of the ice, the glow fading as excess energy was sapped from the air. Without warning he passed out, falling forward down the ice slop. Katara and I rushed forward to catch him simultaneously, Katara beating me to him. Sokka started poking him in the head with the handle of his spear.

"Stop it!" Katara and I yelled in unison. I looked back at the boy as Katara turned him over; his skin was very pale with bright blue arrows tattooed on his hands and forehead. He was wearing strange brightly clothes that didn't seem appropriate for the frigid climate. After a few seconds his breathing changed and his eyes opened. They were breath taking, stormy grey and so innocent. He stared at Katara and whispered to her.

"What?" She asked leaning in slightly. As he murmured back to her. "What is it?"

Suddenly he asked in a very excited voice "Will you go penguin sledding with me?"

I giggled at Katara's flustered air as she responded "Uh... sure. I guess."

We both stood back and joined Sokka as the boy seemed to airbend himself to his feet. But he couldn't have the Air Nomads were wiped out a hundred years ago in the Fire Nation's first attack, unless he was… But he couldn't be.

"Ahh!" I rolled my eyes at Sokka's reaction to the boy's abilities.

"What's going on here?" He asked curiously rubbing his eye.

"You tell us! How'd you get in the ice?" He asked poking the boy with his spear again "And why aren't you frozen?"

"I'm not sure." He replied batting the spear away before gasping as a low rumbling noise came from the other side of the ice ridge. He started climbing back up the iceberg and jumped down the other side. As we ran around the huge crater to join him we heard him yelling out "Appa! Are you all right? Wake up, buddy."

We rounded the last of the ice wall and my jaw went slack. A huge fury animal with its mouth open was licking the boy. "Haha! You're okay!" He shouted at the beast before stretching his arms to hug as much of its head as possible. It had six think stumpy legs and two huge horns protruding its extremely thick fur at each side of its head. Dark brown fur contrasted with lighter fur to create an arrow pattern similar to the boy's. It stood, shaking its coat out like I had seen wolfs do.

"What is it?" I asked curiously.

"This is Appa, my flying bison." The boy told us.

"Right. And this is Sesi, my flying sister." Sokka said pointing a gloved hand at me. I rolled my eyes and punched his arm smiling as he winced. The boy looked like he was about to say something but seemed to change his mind and ducked just in time for Appa to sneeze getting sky bison snot all over Sokka. Katara and I burst out laughing seeing our goof ball brother being even more ridiculous than normal as he rolled around in the snow trying to get the snot off yelling. "Ewww! Aahh!"

"Don't worry. It'll wash out." The boy said brightly before turning to us and asking "So, do you guys live around here?"

Sokka jumped up immediately at the question "Don't answer that! Did you see that crazy bolt of light? He was probably trying to signal the Fire Navy."

"Oh, yeah, I'm sure he's a spy for the Fire Navy." Katara said sweetly.

"You can tell by that evil look in his eye." I finished for her; don't ask it's a twin thing.

We all looked back at the boy who was smiling innocently. "The paranoid one is my brother, Sokka. The more reasonable one is my twin Sesi. You never told us your name."

"I'm A... aaaahhhh... ahhhhhh... aaah, aaah, aaah AAAAAAACHOOOO!" The sneeze lifted him off the ground and high in to the air. Once he was back on the ground he said "I'm Aang."

Sokka's eye had started to twitch when he took a step forward throwing his arms out and said. "You just sneezed... and flew ten feet in the air."

"Really?" Aang asked. "It felt higher than that."

"You really are an airbender." I said putting my hands on my hips.

At the same time Katara gasped out "You're an airbender!"

"Sure am."

"Giant light beams... flying bison... airbenders... I think I've got Midnight Sun Madness. I'm going home to where stuff makes sense." Sokka said before turning to walk off. When he didn't continue I also turned to find that the canoe was missing. Damn! That was one of the good ones! All that could be seen was ice and water.

"Sokka, what happened to the canoe?" I asked my older brother who now had a hand at his forehead like he was desperately trying to think of a way home. He probably was.

"Well, if you guys are stuck Appa and I can give you a lift." He told us before airbending himself onto Appa's head and up to a saddle on his back. He's now holding reigns that connect to Appa's horns.

"We'd love a ride! Thanks!" Katara said excitedly before going over to Appa and being helped up by Aang.

"Oh, no... I am not getting on that fluffy snot monster." Sokka said looking very unhappy and a little bit frightened.

"Are you hoping some other kind of monster will come along and give you a ride home? You know... before you freeze to death." I ask him sarcastically. I smile when he goes to say something and thinks better of it. He sighed and walked with me to the others boosting me up so I could climb into the saddle. In return I offered him my hand and pretty much pulled him up.

As we settled in Katara's excitement was obvious in her delighted expression while Sokka just seemed grumpier than usual sulking with his arms folded over his chest.

"Okay. First time flyers hold on tight! Appa yip, yip!" Aang shouted before snapping the reigns. Appa let out another rumbling noise and flapped his huge flat tail and launched into the air right before coming right back down again with a massive splash. Instead of trying to fly again he just started swimming. Aang quickly shook the reigns again before saying "Come on, Appa. Yip yip."

"Wow. That was truly amazing." Sokka stated from the rear of the saddle, boredom charged his voice.

"Appa's just tired. A little rest and he'll be soaring through the sky. You'll see." He said making a flying gesture with his hand and looking at Katara, he smiled and didn't move his eyes away.

"Why are you smiling at me like that?" She asked him, a blush tainting her cheeks.

"Oh... I was smiling?" Aang asked innocently.

"Uuuuugh." Sokka and I groaned unanimously.

We sat mostly in silence when Katara moved closer to Aang and started a conversation. "Hey."

"Hey. Whatcha thinkin' about?"

"I guess I was wondering – you're being an airbender and all – if you had any idea what happened to the Avatar." I sat a little bit straighter; I'd been wanting to know about this myself and had known it was only a matter of time before she plucked up the courage to ask him.

"Uhh... no. I didn't know him... I mean, I knew people that knew him, but I didn't. Sorry." That was weird; Aang seemed very uncomfortable and the Avatar vanished one hundred years ago, how could Aang, a little boy know people that knew the Avatar?

"Okay. Just curious. Goodnight." Katara said before lying down at the end of the saddle closest to Aang.

"Sleep tight."

I shivered before going a lying down near Sokka, a common occurrence when one of us was upset or unwell. We'd always been close but that bond had only intensified when our Mum had been killed in a Fire Nation raid.

I fell into a troubled sleep and ended up in one of my reoccurring nightmares. I was starting waterbending training with Katara. We were working on form and feeling the push and pull of the water before making a thin column of water rise in front of us. I took a few deep breaths before simultaneously standing with my feet shoulder width apart and raising both of my hands in front of me. The column of water shot up in front of me and I started to count silently in my head to see how long I could hold it for. One polar bear dog, two polar bear dog… By the time I got to eight both my arms and the water were shaking and beads of sweat littered my brow. I frowned in concentration only to have the water collapse.

I looked over to see Katara do all of the same movements as I had, her water column was much shorter and collapsed after a few seconds.

"Good job sis. That was much better than yesterday." I said encouragingly.

"Just go away Sesi." She said turning her back on me.

"What, why Katara?" I asked confused at her hostile demeanour.

"Because you don't understand what it's like." She said bitterly.

"What, what's like?" I was really worried now.

"What it's like to struggle with things." She said glumly. "You're already so good at waterbending and I know you're better than Sokka at hunting and fighting and stuff."

"Hey, that's not true the reason why I've gotten this far is because I struggle. You know how I go walking every morning before breakfast? I don't just walk. I practice. I go over all the stances we know for waterbending as well as all the fighting stances Sokka and I use. I go over the very basics for everything. It's easier to concentrate when there's no one around." I told her softly.

"That's what you do?" She asked turning to face me.

"Yeah, you could come with me. It might help." I said hugging her.

"That sounds good." She said brightly. Snow started falling and we broke apart to play in it. Something was off about the snow though. It wasn't white like normal snow, but grey. We ran back towards the village and found Sokka.

"What's going on?" I shouted when we were about ten feet away from him.

"The Fire Nation is coming!" He shouted back at us. "I'm going to find dad and help him!"

"We'll go find mum!" Katara yelled before grabbing my hand and pulling me away. We ran into our family igloo to find our mother being interrogated by a firebender. "Mum!"

"Go and find your father girls." She told us quickly.

"I'm not leaving you." I said as Katara ran back out to search for our dad.

"Where is the last waterbender?" The firebender asked. The look in his eye was cold and calculating. He had evil eyes and I felt that something really terrible was about to happen.

"I am the last waterbender." Her lie confused me. Katara and I were the last waterbenders unless she was protecting us. I realized this too late as the man smiled his fist flying through the air. Fire streamed from it and hit my mother.

"Mummy!" I yelled running over to her crumpled and burned form. Tears streamed down my face as Katara and the others ran in. The Fire Nation was gone.

"Mum!" I yelled sitting up and bringing my knees to my chest. Sokka who was still next to me sleepily wrapped an arm around my shoulder. We were nearing the village Aang and Katara were still sleeping.

"Again huh?" Sokka asked looking worried.

"Yeah, buts it's okay. It's over now." I said shifting a little bit closer to him. We sat like that waiting until we'd reached the village to wake Katara. "Should we wake him? He looks like he's having a nightmare."

"No he needs his sleep. I'll move him into a tent so he'll be more comfortable." Katara said while standing and stretching. "Sesi will you help me?"

"Sure." I told her as I stood to join her. Together we carried Aang to the only vacant tent available. As soon as we had him laid down on a pelt I left to find Sokka. It was about time we started training. I wasn't surprised to find him with Gran Gran stuffing his face. However this reminded me that I hadn't eaten in a day.

"Sesi, you must be hungry." She said gesturing for me to sit next to my brother before handing me a bowl of steaming food.

"Thanks Gran Gran." I said before turning my attention to Sokka. "So what do you think of Katara's crush?"

"The freak? I don't trust him." He said through a mouthful of food.

"He's strange, that's for sure and he's an airbender. Do you think he could be the Avatar?" I asked curiously.

"The Avatar, no way. The Avatar doesn't exist anymore. I don't know why you would think that anyway." Sokka said brushing off my question.

We finished eating and grabbed everything we'd need for training before heading back outside. Katara had gathered everyone in the village, excited to show Aang off to everyone.

"Whaaaa!" Aang yelled as she dragged him outside. He was clinging to a staff with his free hand, I wondered what it's for.

"Aang, this is the entire village. Entire village, Aang." Katara said happily as she let go of his hand. He bowed respectfully but everyone backed up anyway. They stared at him curiously, distrust obvious in their manner.

"Uh... why are they all looking at me like that? Did Appa sneeze on me?" He asked curiously and started checking himself for bison snot.

"Well, no one has seen an airbender in a hundred years. We thought they were extinct until my granddaughter and grandson found you." Gran Gran said walking up to us.

"Extinct?"

"Aang, this is my grandmother." Katara said, oblivious to his confusion.

"Call me Gran Gran." Gran Gran said happily.

"What is this, a weapon?" I asked gesturing to his staff.

"You can't stab anything with this." Sokka said grabbing the staff.

"It's not for stabbing." Aang told him like it was the most obvious thing in the world; the sad thing is that it was that obvious. "It's for airbending."

He used airbending to take the staff off Sokka and did something to make red wings appear from it.

"Magic trick! Do it again!" Miki yelled, she was one of the very young kids in the village.

"Not magic, airbending. It lets me control the air currents around my glider and fly." Aang told her kindly.

"You know, last time I checked, humans can't fly." That was Sokka, ever the sceptic.

"Check again!" Aang shouted launching himself in the air doing loops and other tricks.

The villagers were so amazed pointing at him as he flew through the air. "Whoa... it's flying... it's amazing!" One of them called out. I saw Aang stare down at Katara, not paying attention to where he was going he slammed into Sokka's crooked guard tower. The only thing stopping me from laughing at Aang, his head stuck in the tower was the fact that Sokka and I had spent a month building it. Without waterbending because he doesn't trust it. He finally got his head out and fell to the ice below.

"My watchtower!" Sokka yelled clutching at his head.

"That was amazing." Katara said as she helped Aang stand up. I watched Sokka go behind Aang to inspect the tower. Aang closed his glider just as a bank of snow buried Sokka.

"Great. You're an airbender, Katara and Sesi are waterbenders, together you can just waste time all day long." He said struggling to get back to his feet.

"You're waterbenders!" Aang exclaimed paying more attention to Katara than me.

"Well... sort of. Not yet." Katara told him blushing.

"All right. No more playing. Come on, Katara, you have chores." Gran Gran said impatiently "Sesi, Sokka start training."

I turned to Sokka as Gran Gran led Katara away. "Do you want to start fixing the tower or go back to training?"

"Let's see just how badly damaged it is then get to boys for training." He said brushing some snow off of his shoulder.

"Alright." I said before walking up to the tower and eyeing it critically. It had never been really great but it was solid and served its purpose. Not that we needed a guard tower. A village of about forty women and children with Sokka and I being to only ones with any sort of useful combat training. It wasn't very badly damaged but we'd need to make a few repairs just to re-enforce the structure. As we walked to the training area I brought up the subject of bending. "I can just imagine how Katara's going right now. 'He's the real thing, Gran Gran' and 'I finally found a bender to teach me.'"

"Katara, try not to put all your hopes in this boy." Sokka said in a poor impersonation of Gran Gran.

"But he's special. I can tell. I sense he's filled with much wisdom." I said continuing our charade. Just as I finished saying this we walked up to where the children had gathered around Aang who had gotten his tongue to his staff.

"Sthee? Now my tongue ith thuck to my sthaff." Aang said slurring. One of the kids, I think it was Suluk, grabbed his staff and yanked at it but his tongue stuck fast making the kids laugh even harder.

"Come on my little warriors." I said squatting. "It's time to train."

We all made our way to the training area where Sokka began his usual lecture. "Now men, it's important that you show no fear when you face a firebender. In the Water Tribe, we fight to the last man standing. For without courage, how can we call ourselves men?"

His lecture was ridiculous because he was talking to a group of boys who were less than six years old. As if on cue Aput raised his hand and shouted "I gotta pee!"

"Listen! Until your fathers return from the war, they're counting on you to be the men of this tribe. And that means no potty breaks." Sokka said harshly.

"Come on Sokka. They aren't men yet and won't be for a long time. It's just a potty break." I said butting in.

"I really gotta go." Aput said when I finished.

Sokka sighed giving in. "Okay... who else has to go?"

All the boys raised their hands before running over to the toilet making Sokka slap his forehead again just as Katara walked up to me and asked "Have you seen Aang? Gran Gran said he disappeared over an hour ago."

Aang was just coming out of the igloo that served as the tribes bathroom. He adjusted his pants smiled at the boys. Gesturing to the bathroom he called out to them. "Wow! Everything freezes in there!"

All the kids laughed at the observation. Sokka, grumpy as ever turned to Katara and said. "Ugh! Katara, get him out of here. This lesson is for warriors only." He was cut off by a high pitched voice yelling "Wheeee!" They had used one of the sawhorses to hold up Appa's tail and were now sliding down it launching into the air and landing in a pile snow. Everyone was laughing, except for Sokka of course. "Stop! Stop it right now! What's wrong with you? We don't have time for fun and games with a war going on."

"What war?" Aang asked hopping off Appa"What are you talking about?"

"You're kidding, right?" I asked while Sokka just stared.

Aang's gaze shifted to something behind us before he yelled so loudly I covered my ears. "PENGUIN!"

He ran so fast he became a blur towards the penguin and Sokka turned to face Katara and I and said "He's kidding, right?"

Katara chased after Aang and the kids finished with their potty break leaving us to get back to training but my heart wasn't in it today. I was too busy thinking about Aang and everything that had happened since we found him. The fact that he didn't know about the war made me think he'd been in the ice berg for a long time, about a hundred years. I didn't voice these suspicions to Sokka as he was already very suspicious of Aang. He didn't look old but Aang was completely clueless about the war and we were in its hundredth year. His awkwardness when Katara had brought up the Avatar was also curious.

I was brought out of my thoughts when a loud explosion went off and a light flew into the sky trailing smoke. I watched as it sunk back towards the ice "Uh, oh. That can't be good."

Well there we have it. I hope it's good.