I've tried a few searches and haven't found one, but some of the concepts have cute TV Tropes titles that make them hard to find.
All the Suikodens do. Xenosaga III has a few items that can either be shared between the female humanoids (Shion and MOMO) or the boy humanoids (chaos and Jr.). A few low level items can be shared between Jonathan and Charlotte in CV: PoR, but the heavy armor and frilly dresses are exclusive to one or the other.
I only brought up TV Tropes because it seems like a few GB concepts borrowed their names from there. Drives me batty.