Theories:
Only Jon or Dany will be alive at the end. Jon for the more fairy tale ending or Dany for the darker ending with more war to come once winter is over.
Sandor dies after killing the Mountain.
Tyrion and Sansa remarry. The bring in the Vale and Riverlands and form the Kingdom of the North.
Arya and Gendry head off to Braavos particularly if Dany is the one on the throne.
Sam is appointed as lord of the reach. Could have strained relations with Dany or cordial relations with Jon depending on who survives.
Jamie dies doing something noble.
Brienne becomes commander of the Kingsguard.
Tormund is given a lordship in the North.
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