After unlocking the Divine Awakening in the story, just play defensively using counterattacks until your Moral gauge is full. Once full, use it to usually one-shot the opposing team.
Antares' member addressWhen you go to the crowning ceremony, talk to Antares two times and he will give you his member address.
Continue bonusesLoad a saved game file from .Hack//G.U. Volume 1: Rebirth to unlock an email from Yachimada, 5,000 GP, some random items, and three bonus movies (.hack// Roots episode 1 A and B, and previews for G.U. 1 and 2).
BonusesAfter loading a game save from .Hack//G.U. Volume 1: Rebirth in which you killed Doppelganger, you can try to kill a stronger version. Go to Delta Elegand Your Shadow and kill off all the monsters. Then go to any island other than the one with the temple and wait about fifteen minutes. Return to fight Doppelganger. He is much stronger than you and extremely difficult to defeat, even with two teammates. He recovers HP every few seconds. If you defeat him you will get two of three weapons he carries (if you defeated him in Volume 1) Heine's Invasion (twin blade), Heine's Shadow (broadsword), and Heine's Zero (scythe). Each are level 51 and are the most powerful in the game.
Higher starting levelIf you have .hack//G.U. vol. 3//Redemption data on your memory card when you start a new game, you can use that data to start at level 70, with high level equipment as well.