This is a list of the customized MS by placing the correct MS in the ACE pilots' slot during the Operation room of the game.( The stats and weapon attacks may vary once you place the ACE Pilots on their respective MS)
Here are a few more custom units that you can unlock...
To unlock alternate characters and facial/costume changes, you have to beat the required stages and storyline in the game.
Eg. by clearing the Gundam, Z Gundam and CCA stages, you will be able to get all Amuro Ray's alternate characters from Gundam to CCA series.
Amuro Ray(0079)-->Amuro Ray(0087)-->Amuro Ray(0093)
[Gundam Cleared --> Z Gundam Cleared--> Char's Counterattack(CCA) Cleared]
After completing certain levels, you will gain money,parts, and unlock units to buy. After unlocking a certain portionof the game, you will get a special unit. Note: Special unitscannot be used in campaigns where the same person is present.For example, Johnny Raiden cannot be used in the Mobile Suit Gundamseries.
This is a list of unlocked Pilot and MS you will obtained by the % percentage of completion in the collection of the game.( Pilots and MS will only be obtained after any mission)