Hello,
Would both players get the same ninjas, or would players get two different sets of random ninjas?
Thanks!

they would both get two different sets of random ninjas, this gamemode will have no ranking either, it's just a timekiller and meant for fun, whilst you can still obtain points and claim rewards :)

Well, judging by how most arena training matches go, it seems like the winner would immediately be determined by who got the better ninjas, and the loser would just immediately quit, would it not?
Imagine a match up where someone gets a fairly balanced set with, say, Lee, Guy, and GNW tenten. And then the opponent gets Founder madara, and....anyone. There's virtually no situation where the second team loses. In the vast majority of situations there's going to be an immediate and obvious team imbalance and most players are going to quit. How do we address that and still keep it fun?

I mean, that's the whole concept of this gamemode.
Luck has to be on your side, it's meant to be a quick win/lose game with only fun intended.
If you lose, you only lose a few minutes.
You can only win by participating in this gamemode, due to the rewards you can earn by playing.

I'd really love to hear what other players think about this.

i'd love to hear other suggestions/ideas to this btw :)

Well to combat imbalance in team selection, ninjas can be given tier allocation.

Example:
Tier 1: base Ninjas like lee, hinata, etc.
Tier 2: Breakthrough base Ninjas like BT Lee, BT Sasuke, etc.
Tier 3: Mid Tier Ninjas like Masked Man, Jonin Minato
Tier 4: God Tier Ninjas like sosp Naruto, 10 Tails Obito, etc.

So the way around this is to make each team be the same level. Meaning the tier level of each team should be the same.
Example: Jonin Minato, BT Lee, Sasuke (3+2+1= 6) vs sosp Naruto, hinata, sasuke (4+1+1=6)

Now the tier system should use a little bit more work because honestly I'm to lazy to comprise a huge tier list to satisfy this game mode, but this is simply just a suggestion for the system the player is trying to push. And there is still a problem of team composition, as even if the level of the teams are the same, some teams work far better than others (which in turn pushes us back to the start of unfair balancing). So, in my opinion, it is a good idea, once you can solve this issue of unfair balancing, as if its there, its just going to be an annoying system that most won't do.

Nvm just realized I just said what Zenith is :/

instead of 3 random ninja, give 4 or 5, so you have a "reroll" in case rng gets you too hard

i like both these suggestions above

So the more you push this system, the closer and closer you get to....Zenith?

EDIT: To clarify, since I'm not sure it's super clear, there is already a codified "tier list" for ninjas: the point list used in zenith. So what you're describing is basically Zenith, but with a few extra and a few fewer steps. And on all the time.

Yeah, this could be seen as a ''Zenith-lite'' mode actually.

That being the case, I can submit an "always on" zenith training mode suggestion for you.

thatd be amazing, thank u.