Hear me out. Two team avatars is a cool concept.
Like we have never really had an "rival" Team Avatars.
We got that kind of with the Red Lotus, but they weren't rivals and more so just anarchists.
Team Avatar (on screen) isn't TYPICALLY (besides maybe the movie), lead by the Avatars, themselves. Usually, they are the powerhouses but sometimes other people tell them to do or they have someone who isn't the leader take charge. Like Sokka or Asami, who is like a non-bender but makes it for their genius and brilliant design for things. Maybe things will change this time.
Pavi's Team Avatar
No. 1: Avatar Pavi. Now I would imagine Pavi follows the mindset of not wanting to be the leader of her own team. Pavi is far too humble and knows that she likely wouldn't the best to do this. I don't think she would to want to do that. She would just be the ace and help out where can, when the Avatar State happens. I would imagine she speaks to Korra and learns the Avatar State is less of a power up but really a self-defense mechanism. That she will be granted the power that Korra has plus her own, but at the risk of them both dying. Making her conflicted over this. Over time, she will become more confident in herself as the Avatar, but I don't think that is happening anytime soon.
No. 2: Jae. Jae is like the leader, as I would imagine he would be Pavi's closest friend and the be a general guiding force for good. He was the first person that Pavi, had a real connection with, and I think that is important for this dynamic to work. I think she would trust him, to teach her and ultimately guide her team. He might not be the best teacher in the world, but he is a good person and Pavi knows that. Another person also knows that, ultimately, and has actually sat down to speak with Jae in, the next person we will talk about.
No. 3: Uki. I think Uki knows, deep down, she doesn't want to be in The Faceless. Zi will bully her for being a traitor once and now coming back, because she didn't like her new life. Those two are destined to be rivals and that Uki will eventually become someone that Zi will realize that she can't just push around. Right now, Uki knows her purpose is to do something greater and that while it wasn't the bender brigade, it might not be working with the Faceless. In reality, it will be actually training the Avatar. This would much like Zuko's decision that he makes as he leaves the Fire Nation, during Season 3 of ALTA.
Now it would be hilarious if the the two people, who have belittled Avatar Korra, are actually training the person who actively commutes with her. Pavi and Korra could have so much fun messing with them, like I have suggested Korra having Pavi start a bit calling them "Sifu". They think this an annoying that Pavi is just on about and then slowly think this just an insult that Korra has for them in old world slang, but in reality, it means something very different. I would look this up, because it's the type of prank that Pavi and Korra play on them lmao.
No. 4: Datu. I would keep him because I wouldn't like Jae and him breaking up. That would actively frustrate me because why make them a couple at all, have Jae actually address the fact, that the has been a terrible boyfriend. Then Datu then is like "I know, but we work on this, together." and he joins Team Avatar because knows how much he cares for Pavi.
The other two are young members but I can see the seem them being like...people that grow alongside Pavi and for to relate to.
No. 5: Ulan. He is a cadet like her sister "was". Pavi isn't the best waterbending so she needs someone she can practice against. So he can get some shine and bro won't just be stuck as just another member of the sidecast that is doing nothing. Ulan seemed like he wanted to help people.
No. 6: Amow. She could be the residual scammer on her team, to get money and support if they are run from the world. Avatar Korra would vouch for the scammer, she knew because Varrick. Now he was despite being a bad guy up until Season 4, he was a smart guy and made that bank! Also would likely use Amow skills for good rather than selfish desires, after spending time with Team Avatar as time goes on.
Nisha's Team Avatar
No. 1: Avatar Nisha. Her initial role is likely, "we are going to turn this child into a weapon of chaos", to the Faceless's older members, I would imagine. They fail to realize (likely Agam) once Nisha overcomes her fear of the world and gets stronger enough, I think that she will just stop listening to her. Nisha definitely after usurping her, definitely changes the identity to Team Avatar as she begins to embrace her identity more. Nisha is the young idealist, with an ambitious dreams that eclipses her prior master's very small desires in comparison.
No. 2:. Agam. The Faceless Queen might lead Nisha's Team Avatar, for like up until maybe Season 3, because you have to have her serve her role as the leader of the Faceless and a mentor figure. Before Nisha just takes it over and converts to her Team Avatar. The irony of Agam helping Nisha find herself only for Nisha to realize that she shouldn't take order from her would be peak.
No. 3: Now Zi might on the same view as Agam, at first, but sees Nisha's growing power and ambition as her firebender teacher. I bet she will even encourage this behavior, not because she wants to betray or manipulate Nisha, but legitimately sees a better leader in the Faceless/Her Team Avatar than Agam's. Because Nisha has always driven by her ideals to what she believes is right, and is a young person, rather than someone that is older. There is more mileage and lifespan, for her their organization, with Nisha leading it.
Agam has likely reached her peak, even if she might a tiny bit stronger once she trains Nisha...but yeah....Zi might help her usurp her. Imagine how proud, she would be watching her student, rise above her and then take over their organization and still put her in like 2nd-in-command for her loyalty. Zi would just nod in approval. That's her like her younger sister, that she wished UKI was. 😆
No. 4: Daemin. Now Daemin might just join because he thinks Zi is HOT and she shows clear interest in him despite him being a goober. Who doesn't love a good romance? Though but seriously, he should join because we need like rivalries and stuff. Like the betrayal Jae, Datu, and Pavi would have would be interesting. We don't know his feelings about the whole thing in Ellora, he might side with them because of the fact, they have a more driven Avatar (on paper) than the other team does. Pavi didn't even WANT to be the Avatar, which make his point more laser focused.
No. 5 and 6: The other two faceless members that with Zi. We know they have Earthbending and Airbending. We haven't seen their faces, but I would imagine they would likely side with Zi, eventually, with the idea of letting Nisha take the wheel and aid her with ultimate desire of "fixing the world". Getting rid of their leader Agam, once Nisha takes charge since they would rather have an Avatar as their leader than a hag. 😂