It would be pretty nice to have these emotes. High Five, Fist bump, Holding hands, Bridal Carry, and Piggyback would be nice to see - except Piggyback and Bridal Carry requiring permission from the other player since you're essentially ferrying the player or getting them to cooperate in a duo-emote.
I would believe edge cases for something like this would be if the character model of the two would be too big of a difference (Roe and Lalafell), forcing the one who is the taller model to carry the smaller one (I see lalafells just sitting on the other player's shoulder like what Raubahn and Sultana does). It should be no issue for races of similar heights though.