Sorry, I could have been more clear on the characters at the bottom of that image. They are enemies. The robotic looking one is Arnie's endoskeleton form, you encounter him on the 4th and final level. But I've never seen its 3 frames that are on the bottom right. The character at the very bottom is also Arnie, possibly an earlier version of what we ultimately got.
Levels are as follows:
1. The Future
2a. The City Streets
2a. Tech Noir (has Arnie)
3. The Police Station (has Arnie)
4. The Factory (has Arnie, in endoskeleton form)
I think there's a level select code somewhere, will be handy for testing. I tested the code for the Reese character on the first level. I can confirm that it switches to future Reese when throwing grenades and shooting the machine gun. Also, his overcoat has a greenish tint/look - unlike the white/grey one he is supposed to wear. Interesting, thanks for looking into this!
