That's an interesting question though I will replace Bran with Rickon as I don't think Bran is coming back.
It would have to be a northman so that rules out littlefinger. Maybe Jon or Wyman Manderley? Not many candidates that stand out.
A northmen should rule the Nord, which maybe would rule out Manderley (he is an Andal, not a First Men). However, I would go for one of Stannis/Davos cause they have forces and if they defeat Boltons and promise to bring Rickon as the Lord of Winterfell, I guess that Northmen will accept that offer.