Well, I can tell who's trying to be Gutrune, Kujura, and Olympia, but no clue on the one on the right (I'm on the verge of finishing the story, which probably isn't far enough). Not sure if Kujura (and the other dude, if applicable) is supposed to still be male here, either.
I'm glad I'm not the only one who saw the resemblance between QB and the shrine switches, though.
Edit: Finished the story last night. Turns out the one on the right is a female knight named Wealh, who's met during certain postgame content.