SRT J brings a decent amount of secrets to the table. As it is though, I've only
managed to obtain Geil and his Graimkaiser, and the IWSP parts for Strike. The
rest of these are taken from webpages devoted to SRT J.
Geil and the Graimkaiser
- On Stage 3, convince (説得) Geil with Eiji
- On Stage 4, pick 賛成
- Take the Archangel Route on Stage 10
- Have a battle encounter between Geil and Eiji on Stage 14
- Geil will be available after Stage 39.
Julia and the Bloody Kaiser
- On Stage 20, convince the unit with unknown pilot data '???' with Eiji.
- On Stages 27 and 35, do NOT defeat Julia.
- Julia will be available after Stage 39.
- Apparently you may not recruit Julia if Geil is recruited.
Balzack & Soltekkaman 1 Custom
- Pick the Radam route after Stage 43
- Have Balzack kill Tekkaman Sword
- If this is not done, Balzack will not be around after your groups rejoin.
Gai and Tsukumo
- Take the Nadesico route after Stage 20
- Take the peace route after Stage 43
Bonta-kun
- On stage 24, defeat Takuma with Sousuke
- On stage 29, defeat Zaido with Sousuke
- On stage 30, defeat Gaulin with Sousuke
- Bonta-kun should be available after stage 34.
Tekkaman Rapier
- On Stage 34, defeat Tekkaman Evil with Tekkaman Blade
- On stage 36, defeat Tekkaman Axe with Tekkaman Blade
- Rapier should be available after stage 43.
X-Aestivalis
- Take the Nadesico route after stage 31
- The X-Aestivalis should be available after stage 32.
Allenby and Nobel Gundam
- On stage 38, do not defeat Allenby
- On stage 41, convince Allenby with Rain. Then defeat Allenby as you like.
- Allenby should be available after Stage 41.
Layzner Mk-II
- Take the route to North America after Stage 31.
- On stage 32, pick the second choice
ISWP parts
- Take the Archangel Route after Stage 10
- Take the Archangel Route after Stage 36
- It will be available on Stage 38
Great Zeorymar
- Note that you must never choose to sorty Zeorymar before stage 32.
- After Stage 10, pick the Nadesico route
- On Stage 13, defeat Lanster of Wind with Zeorymar.
- After Stage 20, pick the Archangel route
- On Stage 21, defeat Garowin of Water and Braist of Fire with Zeorymar.
- On Stage 29, take down Rose Cest La View of the Moon with Zeorymar.
- After Stage 31, pick the Archangel route.
- On Stage 32, defeat Dinodros of Earth, Baston of Mountain and Omzak of Thunder
with Zeorymar.
- The boss should appear with Great Zeorymar instead of the Hau Dragon. Defeat
Great Zeorymar with Zeorymar.
- Great Zeorymar will be available after Stage 36.
A brief analysis of all these secrets and the paths they relate to result in
something along these lines:
Stage 11
-Archangel = Geil 1 + IWSP 1
-Nadesico = Great Zeorymar 1
Stage 21
-Archangel = Great Zeorymar 2
-Nadesico = Gai 1
Stage 32
-Stay = Great Zeorymar 3
-North America = X-Aestivalis, Layzner Mk-II
Stage 38
-Archangel = IWSP 2
-Peace = Nothing
Stage 44
-Radam = Balzack
-Peace = Gai 2
This implies that if you go for Great Zeorymar, the only thing you can get which
is route-specific is the opportunity to save Balzack. The rest of the secrets
can be obtained simply by taking path branches 11-Archangel, 21-Nadesico, 32-
North America, 38-Archangel, 44-Peace (if you want Gai, just go the other for
Balzack)