Character tags added. Since the three girls are different characters, we have two options: Label them as protagonist_(tokimemo_gs#) or label GS and GS2 by their common fannames as I've noticed one other post here already does (daisy_(tokimeki_memorial)). I've opted for the former for the time being, seeing as how that seems to be the more common practice here on danbooru when no official name is given.
I can't tell if these are miniboys are just dolls.