I think most characters who are irrelevant/fufilled all story arc will die
Night king will attack South and not be at the battle but fucking up the South
The cripts skeletons will rise up, fuck up the women and children, get them risen up and then attack winterfell from inside and either winterfell is lost and Jon and Dany choose to burn it down and all people/wights or theyll be like fuck lets do something no one will guess and 50% humans die 80% wights die and its a stalemate/pyrrhic victory for the living and its all sad because everyone that you loved over the years is dead.
Spoiler
ps Arya pregnant w baratheon? Does Sansa like Theon or wtf was happening there