Responses
I think Francois appearance is different cause something might have happened to it. Cause I feel like you could debate that about the old man. why does he still look like an old man in the pictures back when her parents were young and also an old man in present time to fl. But again the old lady/man is apparently a stronger entity.

for those who are confused, yk how ron[?] said supernatural appear different to different "shamans," that's what's up–the old guy appear like an old lady to mieruko's father, that's all it is
also, i think francois changed appearance because it's been so long since he died–idk if im getting it mixed up w another manga and this one is also usingthe same plot points, but it's a phenomenon that happens when a soul is left on the earth for long