Sorry to suspend you! Anyways, I noted, oh wait...
...Actually, it has something to do with that, wow you have good foresight, so about the plaza, there are many reused assets and other things from Streetpass Plaza, such as hats, a stage, and various enemy AI. Not only that, but in Streetpass Mii plaza, there are not only hats of fighters, not only hats of assist trophies, but for various requested characters, so I decided to go through the hats and looked at all the hats and dialed them down to three. Here they are, in order we have the top three. Bandana Dee, Wolf, and the surprising one, Chibi-Robo, since Sakurai said we'd be getting several fighters, (Which means more than two) these could all be considered due to popularity/relevency/uniqueness. And those are my findings.