I feel like they would leave far before the school year ends, considering how many connections the express has it wouldn’t be hard to track them down…

So maybe there’s another reason they have to stay in Twst like they are promised to get a  blessing after they stay there for a while or something like that

Yeah probaply!

But if the trailblazer takes their place it becomes way more certain that they will leave because that us the way of their path, to explore new worlds and keep going.

Twisted Wonderland x Honkai Star Rail

I don't know how it happens but the trailblazer replaces/is Yuu.

So now Riddle needs to deal with "Rules are meant to be broken" in human form

While raising Xehanort something comes up and the Player needs to return to Scala and they just go:

"Alright, fieldtrip time"

(Basically Xehanort goes with Player to Scala for whatever reason)

Childhood friends Xehanort and Eraqus, Player and Brain beeing proud Grandparents and also telling stories about Ephemer...

Like, yes he was a great keyblade wielder but I also saw him fall down the stairs once, stuff like that

Lauriam and Ven not remembering each other and meeting, wouldn' that hurt?

And I guess Aqua, Terra and Ven all would say they will come back and help, they need to do something else first (and then never returning)

Or would Lauriam be able to summon his keyblade with their help? Maybe some unversed show up and he help fight them of?

Would he join them on their journies? Or go alone?

Same with Elrena in Enchanted Dominion

Could one more person help against Xehanort and Vanitas? Could two?

Just some theories I have after finishing the new main story quest

Furina

I think her personalities switch depending on her beeing called Focalores and Furina, I'm currently basing this on Arlecchino calling her Focalores and her answer beeing the confident one. But after that she is called Furina and she is scared and scrambeling again.

And someone mentioned that she is cursed so maybe that's it

Neuvilette

So the gnosis probaply has the other half of his powers, so what if Furina destroys the Gnosis or gives it back to him so he can stop the water?

Currently Celestia is moving towards Fontaine (based on the maps people made) and in Sumeru we learned that Celestia will react if something happens to one.

Just imagine Ephemer rebuilding and seeing Brain out of the corner of his eye, hoping that one of his friends returned just to be disappointed (because I doubt Luxu would have shown himself)

Ok the other hand tho.... imagine Luxu would meet Ephemer. Would he try to play Brain or would he state that he isn't him and just has his body? How painfull that would be... here is your friend, but not!