No, I haven't found a way to change the sprites.
Actually, you may be able to change the sprite images with a tile editor but the graphics of each person are BIG, I find it impossible to create even okay-looking sprites by overwriting the original ones.
Actually, you may be able to change the sprite images with a tile editor but the graphics of each person are BIG, I find it impossible to create even okay-looking sprites by overwriting the original ones.