Super Robot Taisen Alpha Gaiden

Side-story to huge, epic mash-up between a couple dozen super and real robot mecha series. Generally considered to be one of the best in a very, very large series stretching from the NES to the PS3. The game also punishes you for being good at getting skill points by giving you terrible mass-production type mechs instead of Sazabi and other high-tier stuff.

Unused and "Dummy" Mechs
The game contains a long list of Dummied and unused mechs. Many are either alternative versions or holdovers from Alpha as the game run on exactly the same engine. These can be forced into the game either through cheat codes in the bazaar or through a save or hex editor. If you cheat through the bazaar, though, you have to have a pilot compatible with the mech, which you often won't.

In general order as they appear in the hex list:

Duplicates of most ZZ Gundam mooks.

004E, 0050 Alpha version of Quebeley MkII (4800 HP). The Alpha Gaiden version has 4000 HP.

0061 The Gwadan, a ZZ Gundam battleship. Dummied.

0069, 006A Two versions of Sazabi. One has better weapons. The other flies and has better armor. The land version is the one you get on "Easy mode."

006B Alpha Aziel (Char's Counterattack). Dummied.

006C Rewloola (Char's Counterattack Battleship). Dummied.

0085 Zoroat (V Gundam mook)

0088, 0089, 008A, 008B, 008E Dummied versions of Turn-A Gundam. Most have alternative sprites or alternative weapon placements. Likely at some point there were more versions of it to represent how it gradually got more weapons as the TV show progressed.

00AD Wing Zero Custom with more HP and worse weapons (Likely an planned early-game boss version)

00B3 Duplicate of Gundam X with Divider.

00C9 Weaker duplicate of Gundam X

00CA Weaker duplicate of Gundam DX

00DB Duplicate of Iron Gear (May be "boss" version)

00DF Duplicate of Iron Gear with differen Potan Cannon

0103 Alpha version of Daitan 3 (Weaker weapons, different sprites)

0115 Bood (Mazinger Z submarine boss). Dummied. Sometimes glitches when you launch it, possibly because it's not supposed to spawn outside water.

0116 Jet Pilder // Ghoul. Buggy, dummied half-Pilder, half-enemy mook.

013B Texas Mac

0151 Garuda (Combattler V Boss). Dummied.

0152 Minotaur Beast (Voltes V Mook). Dummied.

0153 Voltes V without "Electromagnetic Ball V-Letter Cut".

0160 Skullrook (Voltes V Boss). Dummied.

0161 Voltes V, non-separable, worse stats (another potential early-game boss).

0163 Raideen missing "extra" weapons, similar to early stages of Alpha. Likely at one point you started without the extra weapons enabled.

0169 Weaker, slower Raideen.

0167 Great Sharkin (Raideen Boss). Not dummied, but unused.

01C8 Grungust Kai (Original robot). Unused and not balanced to be a player unit. Another possible early game boss considering the storyline.

01D4 R-2 (Dummied, but stats differ from original Alpha).

01D5 - 01D8 Balmar enemies from Alpha. All dummied.

01D9 Dragon Tiger King. Dummied. Fully functional with hacking.

01DA Tiger Dragon King. As above.

01DB Dragon King Machine. As above.

01DC Tiger King Machine. As above.

01DD Rezun's Geara Doga (Char's Counterattack). Dummied.

01DE Gyunei's Jagd Doga (Char's Counterattack). Dummied.

01DF Quess's Jagd Doga (Char's Counterattack). Dummied.

01E0 SRX (Original. Very weak weapons. Planned Boss version?) Dummied.

01E1 SRX (Original. Stronger but not all that strong weapons.) Dummied.

01E2 R-Gun Powered (weaker weapons than the one used in-game, but weapons have longer range. Planned boss version?)

01E3 Huckebein Mk2. (Original) Dummied.

01E4 Huckebein Mk3. (Original) Dummied.

01E5 Huckebein Mk3 Boxer. (Original) Dummied.

01E5 Huckebein Mk3 Gunner. (Original) Dummied.

Notes: Nearly all of these are functional. Some of the enemy robots like the Bood caused glitches when I tested them. The themesongs for the originals and the R-2 was removed. Instead, it plays the intermission music, which is obviously an error handler result. It's not a default value because the music changes if you use the R-2 and then the Huckebein Mk3. In fact, the game crashes if you use two mechs where the song no longer exists. You cannot use the SRX in any way as even if you have R-1, R-2, R-3 and R-Gun (as required in Alpha) they won't combine. So without save state hacking there is no way to spawn it on a map.

Many of the alternatives are likely planned boss versions. The games are generally designed with bosses having weaker weapons, but longer range, much more HP and more armor. A lot of unused robots fit that mould. Many of the dummied robots, particularly the dummied original robots have been modified since their Alpha incarnations, so they were planned at some point to be present in the game.

Unused Pilots
You can force almost any named character into a robot using hacks. Ones never intended to be pilots will often cause a freeze if you play the cinematics. Some pilots from the original Alpha are statted-out, like Groval (captain of Macross). There are also duplicates of several pilots, including all of the Voltes V pilots and Masaki from Cybuster.

There are also 25 dummied-out pilots, which are helpfully numbered, as well as every NPC, the Skill Get screen and more. Dummied pilots are helpfully numbered. Stats are for level 99.

Dummy1 - Green garbage for portrait image. - No voice clips. - Potential, Assist 1, Shield Defence 9, Sword Cut 9 - Seishin: Hicchu, Concentrate, Tamashii, Iron Wall, Nekketsu, -5 morale to all.

Dummy2 - Seishink: Full heal, Hirameki, Iron Wall, Great Effort, Nekketsu, Kakuran - Potential, Shield Defence 4 - No portrait, does have voice clips (male). - Probably a gundam pilot (A in space, B in air/land), but I don’t recognize the clips. - Really poor stats at level 99. Maybe a grunt pilot.

Dummy20 - Xentraedi ship captain from Macross - All stats zero, no seishin or skills - No voice clips

Dummy21 - Gets up to Telekinesis Level 9, Sword cut 7 and Assist 2 - No voice clips, no portrait. Game just loads enemy portrait. - Likely one of the Alpha 1 archetypes. Nobody aside from originals and Raideen gets Telekinesis.

Dummy22 - Gets up to Telekinesis Level 9, Shield level 9 and Sword Cut 9 - Hichuu, Tekagen, Tamashi, Hirameki, Nekketsu, Move again. - No voice clips, no portrait. Game just loads enemy portrait. Except one time it loans a black portrait once. - Probably also one of the Alpha 1 archetypes.

Dummy23 - Alpha Boss version Ingram - No voice clips - Gets up to Telekinesis Level 9, Shield level 9 and Sword Cut 9 - Hichuu, Tekagen, Tamashi, Hirameki, Nekketsu, Move again.

Dummy 24 - No portrait - Potential, Sword Cut 9 - Concentrate, Accelerate, -5 morale to all enemies, recover 30%, Kiai, Tamashii

Dummy25 - Dragon Machine’s Dragon - Voice is dragon screeching. - No skills or seishin

Dummy26 - Tiger Machine’s Tiger - Voice is tiger growling. - No skills or seishin

Mysterious Voice (Nazo no Koe) - Portrait is the Skill Point Get portrait. - All stats zero at level 99 - No Voice clips.

??? - All stats zero, no seishin or skills - No voice clips.

Not unused, but every pilot who can pilot a given robot, no matter how implausible, has voice clips for attacks that typically involve shouting out the attacks. Things like funnels, fin funnels, every mazinger including boss borot, and so on.

This is likely governed by just a set of flags, but you do end up with Boss saying "launch missle!" when he is hacked into piloting the nuclear missile, likely because that's the same clip recorded for him launching one of the mazinger's missiles.