Board Thread:Spoilers!/@comment-27060727-20161201052050/@comment-25375217-20161217020616

Robin will probably only wear EF-style outfits since that's what he wears in the Wish Realm and he's not sticking around long enough for them to give him a new wardrobe.

I'm going to ignore the possibility that they're retconning OQ's first meeting and say that this confirms Serum Queen is coming back because that sounds like the preferable option ^.^