Super Robot Wars/30/Secrets

Confirmed

Lancelot Albion Zero & Early Suzaku

During the Mission "Zilkhstan's Darkness", defeat Nagid Shu Mane with Kallen before it retreats. Suzaku will join with the Lancelot Albion Zero after the stage.

Full Armor Gundam Mk-II

Quattro's must have a score of 20+ at the beginning of "Augusta Remembrances/A Sign."
During the mission, "Augusta Remembrances/A Sign," Jona must defeat 3 units before the end of turn 2.
If the criteria have been satisfied, Kamille will sortie in the Full Armor Gundam Mk-II.
Otherwise, the Full Armor option parts can still be obtained by completing the mission "Alone in the Wild".

"Alone in the Wild" lowered score requirement

Play "The Man They Called Newtype" or "The White Comet's Contrails". If Amuro destroys 4+ enemies in that mission, the score requirement to unlock "Alone in the Wild" will be lowered from 60 to 30.

Kagero

1. During the Mission "Mutual Trust", defeat Kagero with Shadow Maru, then defeat Kagero a second time with either Shadow Maru, J-Decker or Build Tiger.
2. Gridman, J-Decker and Build Tiger must get a combined score of 80+ to unlock the mission "Seven Officers". Complete that mission before playing "Brave Spirits".
3. Complete the mission "Return of the Mirage".

Leccee's Appearance

During Mission "Cross Point" a dialogue choice will change how Leccee appears during that stage
1. "No way Leccee should change" - Short hair, purple outfit
2. "I can see Leccee's new look" - Long Hair, blue outfit

2nd V2 Gundam

Complete the mission "New Wings" before completing the mission "A Flash Through Space".

Supporter Boss, Nuke and Mucha

During the mission "Life of a Mazin", Koji must destroy at least 2 units after the Majin Power event.

Tatra & Tarta Supporter, Aska & Giant Sang Yung

Complete the missions "Chizetan Storm" and "Imperial Princess" before completing the mission "A World In Turmoil".

Nei Moh Han & Auge

Partially confirmed: Score requirement confirmed, other 5 objectives remain unconfirmed
By the end of the mission "Picaresque", Daba must have a score of 100+ or complete all of the following conditions:

• On the mission "Contact Pentagona", defeat Nei with Daba.
• On the mission "Lady Lady", fight Nei with Daba.
• On the mission "Cross Point", fight Nei with Daba.
• On the mission "Escape Giwaza", defeat Nei with Daba or Leccee.
• On the mission "Picaresque", defeat Gablae and Nei with Daba. <-- this is obviously wrong, Nei doesn't appear in Picaresque

If either the score requirement is met, or the other 5 requirements, the mission "My Love" will unlock. Complete it to get Nei and the Auge. You will also unlock Gablae and the Ashura Temple early.

Supporter Sakura

In the mission "Judgment", defeat Conqueror King Genesic (Triple Zero) with either GaoGaiGar, GaoGaiGo, GaoFighGar or Kakuseijin V2
If requirements are met, she will join once "Future at Stake -VERSUS-" is concluded

True Ending

At several points in the game, Caruleum Vaull (the OG antagonist with the horns) will ask Mitsuba a moral question; once you answer, he'll tell you if your answer tipped the scales left or right.

• Mission "A Towering Light": Answer "Let the billion die." to gain +1 Left points
• Mission "A Purified Land": Answer "Take the life of others." to gain +1 Left points
• Mission "Preordained Destiny": Answer "Treat the clone as different." to gain +1 Left points
• Mission "A World in Turmoil": Answer "Make key crew members exempt." to gain +1 Left points
• Mission "Arbitrator": Answer "Take fate into my own hands." to gain +1 Left points

If you have answered more left than right, you will take the True Ending Route. Otherwise, you will take the Normal Ending Route.
On a New Game Plus, in the introduction of the mission "Judgment", you will instead be given a choice (regardless of point count):

• Answer "The Earthlings must be eliminated by the Quaestors." to take the True Ending Route
• Answer "The Quaestors must repair their faults." to take the Normal Ending Route

Lamia & Betterman Cataphract

During the mission "Future at Stake -VERSUS-", defeat Betterman Cataphract with Guy. He will join after the stage is completed.

Supporter Nora

During the mission "Heaven & World", either defeat Wyver (Dorotheo) with Ernie, or Ernie must have a score of 100+ by the end of the mission. Nora will join once the stage is completed.

Quwasan Olibee & Calvary Temple

Complete at least one of the following requirements:

• During mission "Escape Giwaza" have Daba use the "Talk" command next to Olibee.
• Daba must have a score of 150+ before starting "The Dictator" or "Dreamers Forever".

If either conditions is completed, Olibee will join your team during "The Dictator" or "Dreamers Forever" when Posaydal appears.

Saudade of Sunday (Michael Garret) & Dahlia of Wednesday (Fasalina)

'Michael points:

• On the mission "Towering Light", defeat Gadved with Van. (+1 point)
• On the mission "The Meaning of Happiness", defeat Michael with Van. (+1 point)
• On the mission "World in Turmoil", defeat Fasalina with Van. (+1 point)

If you have 2+ Michael points, on the mission "Endless Dream", defeat Birthday (Claw) with either Van or Ray.
If the previous requirement is met, the secret mission "A Dish Best Served Cold" will be available once you complete either "The Angels Ascend" or "To a Future Filled With Light". Play it to recruit Michael and Fasalina

Victim

During mission "Heart to Heart" or "To a Future Filled With Light", both Victim and Fire J-Decker must fight Big Mother at least once each. Big Mother must be defeated by either Victim or Fire J-Decker.

Supporter Akane

Akane points:

• On the mission "Awakening" / "Destruction", defeat Devadadan with Gridman (+1 point).
• On the misson "7 Officers", defeat Anti with Gridman (+1 point).
• Complete mission "Melancholy" (+1 point).
• Complete mission "What the Heart Dictates" (+1 point).
• On the mission "Creation" / "Awakening", defeat Zegga with either Gridman or Gridknight (+2 points).

On the mission "Creation" / "Awakening", if you have 4+ Akane points by the time Alexis Kerib appears, defeat him with either Gridman or Gridknight. Akane will join as a supporter once the mission is completed.

Katejina & Cronicle

Katejina points:

• On Earth Route "Warriors of the League Militaire" / "Encounter in Space", defeat Cronicle with Üso (+1 point). Defeat Lupe with Üso (+1 point).
• On Space Route "League Militaire" / "A Voice Calling in Space", defeat Katejina with Üso (+1 point).
• On Space Route "Free-For-All", defeat Lupe with Üso (+1 point).
• On the mission "New Wings", fight Katejina with Üso (+1 point). Defeat Katejina with Üso (+1 point).
• On the mission "Infiltrating Zanscare", Katejina with Üso (+1 point). Defeat Katejina with Üso (+1 point).
• On the mission "The Red Comet's Duty", defeat Cronicle before before the Dreisstrager arrives (+2 points).
• On the mission "What Follows Myth", defeat Katejina. (+1 point)

If you have 4+ Katejina points, on the mission "The Angels Ascend" / "Above the Angel's Halo", do the following steps in that order:

• 1) Defeat Zoltan while Cronicle and Katejina are still present.
• 2) Defeat Katejina with Üso.
• 3) Defeat Cronicle with Üso.

On mission "Doorway to the Abyss", select "I can sense Katejina!".

Unconfirmed

Supporter Clef and Cephirans

Requirements unknown
Possible theory: Complete one or more of the following missions before completing "Dark Invitation"

• Imperial Princess
• Chizetan Storm