Have one of the following Game Boy Advance games in the cartridge slot to unlock the corresponding bonus.
EG Armor: Super Robot Taisen A. This part gives HP Regen (L) but does not stack. It is worth 45,000.
Time Flow Engine: Super Robot Taisen R. This part gives EN Regen (L) but does not stack. It is worth 50,000.
Res Arcana: Super Robot Taisen D. This part gives Double Image, Beam Coat (L), and HP Regen (S). It is worth 55,000.
Orgone Cloud: Super Robot Taisen J. This part gives Double Image, Barrier (L), Ignore Terrain, and EN Regen (S). It is worth 70,000.
Tesla Drive: Super Robot Taisen: Original Generation. This part gives Movement +2, Mobility +20, and Air Terrains S for both unit and weapons. It is worth 60,000.
Z.O Armor: Super Robot Taisen: Original Generation 2. This part gives HP +2,000, Armor +300, and EN +150. It is worth 65,000.
Prana Converter: Super Robot Taisen D2. This part gives Attack +500, Range +1, Critical Rate +30, & Hit Rate +20. It is worth 100,000.
Godanner (Sword)
In Stage 15B part 2, do not allow Lou to fight with any of the mimic monsters. It will join after complete Stage 30C part 2 (Godanner route).
Michael and Fasalina (GxS)
In Stage 8, allow Van to defeat the axe character. In Stage 26A, allow Vann to defeat Carossa. In Stage 27, have Vann's kill count reach a certain level. In Stage 31 part 1, defeat Woo and Fasalina first, then defeat Michael. Michael and Fasalina will join after Stage 31 part 1.
New Game +
Finish the game once and save. You will be able to load that save and start a new game with half your money carried over, your chosen favorite series carried over, and choose a new senshin set for the originals.
Rey and Stellar
In Stage 14A part 1, do not use Kira to defeat Shinn. In Stage 14A part 2, do not defeat Shinn. In Stage 15A, do not take out Shinn, Rey and Talia. Rey and Steller will join in stage 30 in the Fafner route when Minerva helps in the event.