* Usagi will have the new
forms and
new attacks for the last few seasons. (She gets wings!)
* She'll be more matured. Most notably, she'll be more able to cope on her own and better able to handle losing people (it will still hurt, obviously, but she won't fall apart over it quite as much). She's learned she can survive and fight on her own, even if she still desperately wants everyone with her and can be insecure enough to ask Mamoru several times in the space of a few minutes if he loves her. She'll still hate being away from her fiance; yes, she's engaged finally. She'll happily show off her ring now that she actually understands it.
* She'll understand a few key concepts differently. While she is still the heiress of the Light herself, she understands that Chaos and the Light of Hope both must and will exist within everyone. She's not as reflexively afraid of that. In fact, she has traded away the chance of perfect peace and the end of the cycle of war for the sake of being able to have rebirth and renewal as well. She is still Faith and Justice, but less rigid about it; the lessons from Black Moon (who rebelled because she exiled them for refusing her purification) have finally sunk in. She has always loved the people she's met in Adstring, but she will be more able to love Adstring itself for their sake and for letting her meet them.
* She's forgotten Adstring. Friends will pretty much automatically be greeted with the attitude that if they were friends before, they are now, too. She will gradually remember people much more than events or things that have happened. She'll remember being friends much more easily than specific encounters or conversations. As she does start to remember some events, what she'll remember most are the positive things, and not the negative.
* She is still too quick to trust and believe. In the end, what saved everything and let her defeat the origin of all evil in her world was that very refusal to give up hope. Although she tried to understand the senshi's warnings, and treated them thoughtfully, in the end she was still willing to approach the Starlights and even reach out to Galaxia herself. She can still be overly innocent about romantic intentions; hanging out is just hanging out and she can be shocked if people see it as a date. She remained mostly (or perhaps intentionally, to avoid the emotional struggle in the times she did seem to realize it more) oblivious to Seiya's feelings.
* She'll still be colorblind from her death penalty. Rather, she'll soon be colorblind again. Suddenly.