You All Look Familiar/Playing With

Basic Trope: Every NPC and/or enemy in a video game looks the same.

Straight: Enemy soldiers look exactly the same as the one next to them, down to facial features.
Exaggerated: It turns out that every soldier is an identical twin of their comrades.
Justified: The Hero is fighting an army of clones
Inverted: All enemies have a different model, but your comrades all look identical (you included).
Subverted: Every soldier has a unique model...
Double Subverted: ...until you realize that those unique models are recycled in later levels.
Parodied: Every soldier's model has a prominent nametag which says "Pvt. Generic".
Deconstructed: All the soldiers you face are wearing identical masks or face-concealing helmets...
Reconstructed: ...but they all look the same underneath their masks/helms.
Zig Zagged: ???
Averted: You have no allies or enemies.
- There is a random-generation algorithm for character models.
Enforced: Because of time and budget constraints, the developers had to use the same model for all enemy NPCs.
Lampshaded: A character in your squad exclaims: "Didn't we just kill you two levels ago?"
Discussed: Your True Companions ask "Why does everyone look the same?"
Conversed: "Man, you ever notice how every adversary in a game looks the same?
Plotted a Good Waste: They don't actually look the same - it's a Unreliable Narrator thing! They look the same to you, because the player character has no reason to really distinguish between them.