Hello! I've not been in this thread before, but I figured this will become the new home of TMS#FE speculation, so I'm here!
The prospects of Azura opens the door to really any FE character, so that leaves a lot of options for Barry... I'd be surprised if they didn't include a Three Houses rep somewhere, but how classes work in that game allows for basically any character who work with Barry if the devs want them to. His outfit is based on his dog costume, so that doesn't really give any clues...
I do wonder how these new characters will work with regards to the side-stories already present in the game... Do they join as part of those side-stories, or are they adding new ones? I am going to be very heart-broken if Tiki's playable status removes our encounter with TIki=Waifu, as that was one of the funniest characters in the game.
Also, Tsubasa seems to have stolen Futaba's glasses. Seriously, they seem to be the same design.
I am really hoping the game does well, but the fact the calls for boycott have already restarted makes me a bit nervous... The combat system is so incredibly fun that I would love to see it get sequels.