This game's art style and character design is really amazing and I believe it deserves to be showcased somewhere within the game.
This is why having a 'Gallery' section would be a nice extra feature to add if the time and resources permit it. It would be the perfect place to display hi-res models of NPCs (Protectors, our trusty pilot Cortez, etc.), enemies of the different factions, vehicles, bosses and so on (maybe even the Raiders comics??). The model viewer could be similar to the one currently being used in the Raiders menu.
As for how each character or model from the gallery would be unlocked, I would go with either clearing their respective missions or unlocking them with faction points (most enemies and characters come from one of the four factions after all, so it would be logical). An alternative unlock method could also be to hide special 'gallery tokens' in each level that would need to be found and destroyed by the raiders during the course of the mission.
