1. Put Marienne and her Origin in your party.
2.Keep Maya,Lang,Sharon,Ayne and Kazan and their origins.
3.Keep the same Auto System.
4.Ask Marienne to join your party.
5.Let Marienne's Origin attack the enemies and not the allies.
6.And put Marienne's brother Elliott to join your party as well.
7. Keep the same battle system.
8. Larger World
9. Boyfriends and Girlfriends!
10.Change Marienne into a good ally (She was a villian in Legaia 2.
11. Add Marienne into a new character.
12. Change Marienne into your new friend.
13. Like on Star Ocean Till The End of Time that Albel is in enemy and later he become a new friend,Make Marienne's brother to join your party too. Please! (Marienne and Maya are my favorite characters.) I have a big wishlist:)!!