Owen Lars and Bail Organa
In retrospect, it seems such a ridiculous missed opportunity bringing them back for this show, only to do virtually nothing with the characters.
The two were terribly underused in the prequels - given the status we associated with them from the OT - and this show could really have fixed that. Instead the show put more focus on nothing characters and a pointless story which didn't really go anywhere other than giving us canon breaking light saber duels.
What a waste and a shame.