I also think Aerith didn't change much, but I really like how she is in the remake. In Crisis Core, she was younger, and in Advent Children, she was in the Lifestream. Of course she's not like in the in the og and the remake. I like how sad she always looks behind her huge smile to be honest. It makes her feel real. I've always interpreted her as such, but now, we see it. I also really love her new fighting style since she feels like a mage.

That being said, I think the character who improved the most is Cloud, not because he necessarily improved, but I really like how they pictured his confusion and how he's not well. I love how awkward he is, too. It's something that, without good graphic and without voice, was harder to see. They put the emphasis on the fact that he's trying to be cool but not always succeed and it's really fun to see :P