Na'vi:

I gave them four arms, four eyes, and breathing holes. I cheated a bit and gave them a "nose" by adding heat sensing pits above their mouths just because I find they look weird without any. Their brain tendrils are a bit sturdier in my version and lack the delicate filaments on the ends, instead they just clasp other tendrils and pass information through skin contact. Seems like a safer method because it avoids the risk of passing infections (along with looking less… Gross). I threw in some digitigrade legs and longer tails just because I thought they'd be cooler that way.

I've overhauled their reproduction process entirely. Instead of mating as we do, they instead turn into stationary pods once they reach old age and gestate baby Na'vi inside them. The babies are then raised by the entire clan. To increase genetic diversity, pods will reach out to one another with roots and exchange DNA as well as memories from their lives. When enough pods take root in the same place, they will form a great tree that provides their clan with shelter. (In my version, the hometree and the tree of souls are one in the same.) Although they lack romantic or sexual partnerships, Na'vi can form strong bonds with each other.

Na'vi society in my version would be more biopunk. All clothes, weapons, and tools are alive in some way. Everything the people use has been carefully bred over millennia to fulfill a specific role without disrupting the delicate balance of nature around them. While I didn't draw them here, the weapons they use are very reminiscent of those featured in Half Life: Opposing Force, with bug-guns that spit acid and such.

Avatars:

My Avatars only have one set of eyes and vestigial secondary arms. This is because the human brain can't handle having so many extra appendages, so special goggles and mechanical prosthetics are added to compensate. They also lack bioluminescence because human scientists haven't figured out what gene produces it in the Na'vi (Some speculate it might be the result of a symbiote living under the skin, however vivisections were inconclusive).

Early tests resulted in Avatars waking up on their own and going rogue, thus they had to be euthanized. Chips were installed in their brains to shut them off while pilots weren't active. Avatar pilots still require rigorous psychological training just to retain control of their alien bodies. Jake especially has a difficult time with it since he's also inhabiting a body that was originally made for his deceased twin brother. The combination of mourning and body dysmorphia takes quite a toll on him. Being able to walk again is nice, but is it worth it?

Story changes:

I admit I'm not skilled enough of a writer to come up with an entire script rewrite, but I do have some key changes in mind. Firstly, I'd keep Neytiri's lost sister from the deleted scene and it would serve as a parallel to Jake losing his brother. Jake and Neytiri's relationship would be like that of siblings rather than lovers.

Once Jake is fully integrated into the Omatakaya, the elders trust him enough to share one of the Na'vi's most precious secrets: their nursery at the heart of their tree. Jake is astonished, and horrified to realize the RDA will kill infants in their search for resources. He informs Quaritch why the tree is too precious to be cut down and Quaritch agrees to back off… Only to go back on his word and cut down the tree anyway. The RDA was never interested in harvesting "unobtanium" they want to exterminate the Na'vi and replace them. The company has given up on Earth and wants to colonize Pandora as the new home of humanity (or a twisted, genetically modified version of it).

Jake and Neytiri barely survive and escape the attack. Neytiri isn't angry at jake because she understands this isn't his fault, but they are at a huge disadvantage. It is then that Jake suggest they attempt to tame a Toruk. In this version, no one has ever managed to do this before because it turns out Toruk has 4 brain tendrils! Jake and Neytiri tame and ride it together, going on to unite the clans as seen in the movie.

His voice droned on and on. It was like a parent reminding their child to do their chores, because they were going away on a trip. Which was true, the vice housewarden was going on a trip. He was going to Fleur City to go to a social gathering. Meeting other mages at the smaller school of Nobel Bell College. It was especially exciting because around this time there was a festival that happened once a year. However he wasn’t talking to a child. No, he was talking to his housewarden who was looking at him with wide eyed attentiveness. However the red haired man sitting in the same room thought otherwise. Sure his housewarden wasn’t the smartest man alive, but he was still capable at times.

“Jamil, he’s not a child,” The redhead groaned. “Kalim can handle himself just fine.”

“Augh, I’m just worried!” *Jamil said. He then put both his hands on Kalim’s shoulder’s. “Are you really going to be okay on your own for three days?”

“Don’t be such a worrywart, Jamil!” Kalim chuckled. “Nothing’s gonna happen. And if something does happen, the rest of the guys in Scarabia will be there to help. It’ll be fine.”

“Yeah, I mean you did give all of them a manual,” The redhead added.

“See we’re good,” Kalim said with a smile. However his smile soon faded into a frown. “Although I wish I could’ve gone to Fleur City with you and Valerio. The name alone makes it sound beautiful. Aren’t you two excited?”

His smile then returned in the matter of seconds as he beamed at both his fellow classmates. “This is a chance to make friends from other schools. You two lucked out big time!”

“Yeah maybe we’ll even find Jamil a girlfriend or something,” Valerio chuckled.

“You think so?” Kalim asked excitedly.

“I doubt it,” Jamil spat as he glared at Valerio. “One single social wouldn’t be enough to form any meaningful friendships. Let alone a relationship.”

“You never know~” Valerio playfully teased. Smirking as he was immune to Jamil’s glares by this point.

“Although I am looking forward to touring somewhere new,” Jamil remarked. There was a smile on his face as he spoke.

“Yeah there you go! I’ll be super happy if you two enjoyed yourselves. Tell me all about it when you two get back,” Kalim beamed.

“Don’t worry we will. I’ll even bring you back something,” Valerio smiled

“Really?” 

“Really, Really.”

“Thanks, Val! You’re the best.”

“Anyways,” Jamil interrupted. “Please be careful, and don’t get injured or sick while I’m away.”

“Sure thing!” Kalim grinned.

“All right, let’s go over it one more time. Towels are on the left…” Jamil started.

“Again!?” Kalim yelled.

Valerio let out a groan as he rolled his eyes. Not wanting to hear Jamil go through this for the millionth time; he got up and headed to his room to pack. As the redhead traversed through the halls he could hear the groans of his fellow dormmates about Jamil’s manual. A part of him was lucky that he got picked to go on this trip. Otherwise he would have to read the endless pages of rules and instructions. The mere thought of it made Valerio shudder as he finally got to his room. He opened the door and was expecting to see the room empty. However, there was a student sitting on top of his bed holding one of the pillows. If it was a Scarbia student it wouldn’t have been out of the ordinary, but the brunette was from Octavinelle. Thankfully Valerio knew the person, but that didn’t quell his confusion. Their cyan eyes landed onto Valerio and they smiled at him.

“What’s up, Val?” The student asked.

“Nothing much, but what are you doing here Salem?” Valerio asked.

“Floyd and Jade are tearing up the Mostro Longue because they were mad that they didn’t get picked. So I thought I’d come here to get out of the crossfire.”

Valerio nodded in understanding. He had forgotten how violent the twins could be sometimes. He then moved to his bed to get his suitcase out from under it. 

“Well, I’ll be here packing for that trip. Hope you don’t mind,” Valerio said as he turned his back on Salem and opened up his closet. Revealing a wide array of Scarabia uniforms.

“You still haven’t packed yet?” Salem asked in disbelief.

“No, I was helping Jamil organize everything for Kalim.”

“Ohhh… Well Azul’s practically got everything packed down to the letter.”

“Of course he has,” Valerio slightly rolled his eyes at the mention of Azul. “Always prepared for anything.”

“Yeah… but hey maybe on this trip you two can finally kiss or something.”

That made Valerio’s face heat up. Him and Azul… kissing? To be fair he has thought of things like that. As much as Valerio hates to admit it. However, he knows that it’ll never happen. After all Azul hates him and is only teasing him because Valerio’s done it countless times before. So there’s no way he’d actually do it… right?

“D-don’t be ridiculous Salem that won’t happen,” Valerio dismissed as he packed a school uniform into his suitcase.

“Oh come on, Val, you two have been practically flirting with each other for a year and a half,” Salem insisted.

“Speaking of flirting, how's your flirting going?” Valerio asked. A bit of tease was in his voice, but really he wanted to change the subject.

Now it was Salem’s turn to blush profusely. They instantly dropped the pillow and waved their arms around.

“W-well it’s just that… well you know… I… haven’t done it yet,” Salem muttered. Looking away in shame.

“Did you get cold feet again?” Valerio guessed.

“Wha- no! He was just really busy and I-I didn’t want to bother him is all!” Salem stammered, but they still weren’t looking at Valerio.

“Uh-huh.”

“Ok, as his childhood friend you should know how busy Vil is. Imagine you're in a conversation and someone walks up to you and is like, ‘hey baby what’s up?’ Like that’s so incredibly rude. He already thinks Octavinelle’s shady anyways. I don't want him to think I’m rude on top of that. And it would’ve been even more awkward if I was just standing there. Actually not only would it have been awkward, it would've been a bit creepy as well. I mean could you imagine…”

That was the second time today that Valerio has heard someone ramble. However this one he couldn’t escape from it. Not that he minded since he found that Salem’s ramblings could be amusing at times. Despite the onslaught of words the Octavinelle student was saying there were a few words that stuck to his mind.

“Maybe on this trip you two can finally kiss or something.”

Those words replayed in his mind. All while a scene flashed before him. The two of them standing in a plaza of flowers. His beloved rival standing in front of him, his gray eyes looking at Valerio with love and adoration. The smirk he usually wore was replaced with a smile. A genuine warm smile that made Valerio’s heart swell. He would hold Valerio close and whisper sweet nothings into Valerio’s ear. The oranges and reds of the sky only made the scene more romantic and warm.