Unlock the following characters by performing the corresponding tasks:

CHARACTER - HOW TO UNLOCK
Amuro Ray - Successfully complete the EFF campaign under the Very Hard difficulty then load the cleared saved game.
Char Aznable - Successfully complete the Zeon campaign under the Very Hard difficulty then load the cleared saved game.
Fraw Bow - Successfully complete a campaign under the Very Hard difficulty then load the cleared saved game.
Gundam - Reach the "Warrant General" rank.
Kai Shiden - Successfully complete a campaign under the Very Hard difficulty then load the cleared saved game.
Kampfer - Reach the "Lt. Colonel" rank in the Zeon campaign.
RX-78-2 Gundam - Reach the Colonel in the Federation campaign.
RX-78-2 - Complete Zeon and EFF modes, then repeat EFF mode again until late December.