1PupSuits sent me an email back in December about a glitch they had found in Star Fox Assault. If you used the sniper rifles in multiplayer mode with multiple characters, and stood at the right spot, the low-poly version of your character would appear instead. I did some tests and it worked! I also found that it had less to do with the sniper rifles and more to do with where your camera was and certain angles. This is a glitch with the level of detail (LOD) system in Star Fox Assault. Normally, LOD is used to make small objects in the distance use less resources. Star Fox Assault does this, however it looks like you can trick the system sometimes.
I made this video to demonstrate. I played the game at ludicrous resolution on the emulator so that after I cropped the fourth of the screen from the four-player split screen, you could still see a lot of detail. Hope you enjoy!