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
lenna:33AD44,33AF80,33B1BC
galuf:33B46C,33B6D0,33B930
faris:33BC04,33BE5C,33C0A0
krile:33C35C,33C5A4,33C7EC
boko:33CAA8,33CD0C,33CF70
cid:33D248,33D4B0,33D718
mid:33D9F8,33DC34,33DE70
dorgann:33E120,33E388,33E5F0
kelger:33E8CC,33EB54,33EDDC
xezat:33F0DC,33F348,33F5A4
king tycoon:33F874,33FAD4,33FD34
gilgamesh:34000C,340268,3404C4
exdeath:340798,3409EC,340C3C
phew...
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.