I really hope we'll see Invi speak at least once - she's the only Foreteller who's still silent. (And since Luxu's keyblade is two-thirds of a Chimera, I kind of wonder if her being the snake bodes poorly for her...)
Past that... I keep envisioning a callback to the Kairi waking Sora scene, with Ephemer (and Skuld?) offering a hand up to the player. Maybe in the Graveyard after the war, maybe "in the unchained state."
I want them to find the Player in the graveyard, and they are happy to see them. The Player gets up, but is visibly sad, the Daybreak Duo tries to comfort them. The Player remembers what Ira said about a victor, and whoever is in the Graveyard is the one. They look at them and begin talking making the moment sadder. The Player picks up their Foreteller's Keyblade and proceeds to nearly stab themselves so a victor is not born. Before that happens, Ephemera and Skuld stopss the Player by clashing Keyblades with them, a fight begins. The Player easily beats the Daybreak Duo and proceeds to say goodbye. Before jabbing themselves with the Keyblade, a single tear falls from the Players eye. The Players body fades and both Keyblades they used drop onto the ground. It zooms onto the Players tear falling onto the ground. Then cuts to a older Ephemera and Skuld, something reminds them of the Player and they proceed to talk about the sacrifice they made, or completely forgot about them.
Now would that be a great way to bring up the feels?
Also I have a feeling the song that would play, during the Boss Fight with Ephemera and Skuld would be a warped version of the Daybreak Town Battle theme, similar to The Other Promise
In other words a complete heartbreak for the Daybreak Duo and us
Also put how the convos would go.