The Star Guardian Skins should have a transformation animation at the start of the game.
I mean, noone can deny that they are very closely inspired by the Manga/Anime series Sailor Moon, so why not give them a transformation sequence in the first 5 or so seconds of the game while noone can leave the fountain anyway.
They could start as the normal skins and then have some nice animation becoming the star guardian Skins, would give them a nice additional touch.