i don't want to get spammy here, but i found their portraits.
bartz is at 33A5E4,33A834 and 33AA7C everyone has 3 pictures for some reason,everytime in another palette it seems
ok, those are all portrait offsets, you have my full Support at you project
p.s. i don't know how the snes spritesheets are looking like so i can't compare, but if you want i can send you a gba one.