Ok based off the information we have and the starters used in the original game I say we have a good selection pick.
Of course they could always pick the originl kanto starter trio but to me it wouldn't feel as cool? But i digress because everyone wants Mega-Greninja.
So we have 27 starters to choose from and right off the bat we can eliminate a bunch of them. Rowlet, Oshawott, and Cyndaquill were used in the first legends game so It's highly unlikely one of those three will be chosen again. so 24 starters remain.
6 starters, Bulbasaur, Charmander, Squirtle, Torchic, Treecko, and Mudkip already have mega evolutions and I think the starters in this game will probably get Mega Evolutions? Or regional forms, or both. But that turns the starters remain from 24 to 18.
Next up, I mean realistically they are not going to make a Mega Evolution/Regional form for gen 9 starters that are recently introduced. Getting gen 8 starters is a possibility because last legends game was released during gen 8 and they had a starter from gen 7, but not gen 8. So its highly unlikely we will see one of the starters from the paldea region. The remaining starters went from 18 to 15.
Sorry I didn't eliminate this trio earlier, But if game freak wants to stay true to the original legends game, The kantos starters have to go. The remaining starters went from 15 to now 12.
Kantos is based in france which is interesting because some starters look like they are french in essence. Such as Serperior which looks like it is meant to represent french royalty, Scorbunny repersents a soccer player, and if you know anything about soccer, french people are OBSESSED with it. For the Water starter, I had a harder time selecting so tbh even though i said I eliminated the kantos trio earlier I just have to add Froakie (But mainly for its final form, Greninja). It's badass, Game freak loves it, The fans love it. In fact it was voted the most popular Pokemon and the most popular starter back to back in 2020, Which goes to show how much the fans like it.
I hope y'all enjoyed my starter prediction!
Sableye out.