I think Roselia’s Autumn Rain costume set has become my favourite costume/set, just because the DreamFes PoPiPa set is... a DreamFes set. I’m really happy that this was my first completed set.
But I really want Roselia’s 7th Live / Hitze costumes to be in the game as well. If we’re talking about all costumes, that’s at the very least my 2nd favourite Roselia set.