Super Robot Wars/Compact 2/Secrets

Obtained in this game

Galaria Nyamhee

Stage 2-4: Do not shoot down Galaria. Will join after the stage.

Gaplant (Rosamia Badam)

Stage 2-5: Convince Rosamia with Kamille. Will join immediately.

Todd Guiness

Stage 3-2: Convince Todd with Shou. Will be obtained after the end of Scene 3.

Kampfer

Stage 3-4: Play as the 3rd or 4th stage, deploy Shiro. If you play stage 3-3 before 3-4, Shiro will be unavailable for Stage 3-4.

Minerva X

Stage 4-3 (Earth): Kouji convinces Minerva X. Anyone can shoot it down after that. Will be available after Scene 4.

Mass Production Great Mazinger

Stage 1-4: Play after Stage 1-5.
Stage 4-3 (Earth): Tetsuya convinces and then shoots down MP Great Mazinger.

Full Armor Gundam

Stage 4-4 (Earth): Wait 10 turns, and then have Bernie defeat Char Custom Zaku and RX-78 Gundam. You will receive it after completing all selects in Scene 5.

Apsalus (Aina Sahalin)

Stage 4-5: Reduce Apsalus to less than 20% HP, convince Aina with Shiro. Will join immediately.

Gouf Custom (Norris Packard)

Stage 4-5: Convince Norris with Aina and Bernie.

Texas Mack (Jack King, Mary King)

Stage 5-1: Play as the 3rd or 4th stage.

Psyco Gundam

Stage 6-4: Play after 6-3. Have Kamille defeat the Psyco Gundam. Received before 6-5(?).

Obtained in a future game

Aggressive Beast (Dancougar)

Part 1: Upgrade all of Dancougar's stats and weapons at least once. (Dancougar leaves permanently after the end of Scene 1.)
Part 2: Dancougar will automatically have the attack available.

Elpeo Puru

Part 1: In Stage 3-4, convince and then shoot down Reika, Beauty, and Toppo. (Banjo must be used to convince them.) Defeat Puru when she appears.
Part 2: Obtained at the end of Scene 5.
Note that Puru and Puru Two are mutually-exclusive.

Sirbine

Part 1: Take the Earth Route in Scene 4. (Clear Stage 3-2 first or second)
Part 3: Receive at the end of Scene 4, along with Silky Mau.

Zwauth

Part 1: Take the Byston Well Route in Scene 4. (Clear Stage 3-2 third or fourth)
Part 3: Receive at the end of Scene 4, along with Silky Mau.

GP02A

Part 1: In Stage 3-3, have Shiro defeat Apsalus in Gundam Ez-8. Part 3: In Stage 5-6, have Shiro defeat GP02A.

Neue Ziel (Anavel Gato)

Part 1: In Stage 6-2, allow Glemmy to retreat.
Part 2: In Stage 4-6, fight Gato with Kou, and then convince Gato with Quattro.
Part 3: In Stage 5-3, have Quattro and then Kou convince Gato.

Scene 7 (Compact 2-3)

Part 1, 2, 3: Clear Stage 6-4 of Part 3 with a final turn count of 777 or less.