Basic Trope: A member of an otherwise identical group has a distinguishing feature.
- Straight: Alice is the only member of the Tropian Redshirt Army who doesn't wear a helmet. She's the only Tropian with a name and any character development.
- Exaggerated: All of the Tropians are identical looking 4' high, blue Rubber-Forehead Aliens, except for Alice, who just looks like a human with blue skin.
- Downplayed: All the Tropian characters dress the same except Alice, but they're each portrayed by actors with unique prosthetics.
- Justified: Alice is the only Tropian who's interested in interacting with humans. The rest wear their helmets to keep out the smell.
- Inverted: Alice is the identical twin of an important character, making her the only Tropian without a unique appearance.
- Subverted: Alice proves to be a Redshirt. The rest of the army remove their helmets at her funeral and several become important characters.
- Double Subverted: Outside of this group, Tropians still wear their helmets.
- Parodied: The Tropians pray to "Makup D'patmnt", the god of individuality, for permission to remove their helmets.
- Zig Zagged: There are several Tropians who don't wear helmets, but they don't always appear with the rest of them.
- Averted: None of the Tropians wear their helmets (all the time at least).
- Enforced:
- The makeup for Tropians is too expensive to apply to all the extras.
- The creators of the work want to make it obvious which Tropian is supposed to be Alice.
- Lampshaded: "Are your friends gonna take their helmets off?"
- Invoked: "You guys keep your helmets on; I'll do the talking."
- Exploited: The Tropians actually hire quite a lot of human criminals as mercenaries. Having them wear their helmets all the time helps keep this secret.
- Defied: Bob refuses to let Alice on board unless her comrades remove their helmets too.
- Discussed: "OK, find one without a helmet; they're probably going to be our token Tropian."
- Conversed: "So, are the rest of them keeping their helmets on to save the budget?"
- Implied: Alice is mentioned in passing, and one of the Red Shirt Tropians has a slightly different helmet, but it's never confirmed if they're her.
- Deconstructed: The lack of any individuality means that non-Alice Tropians are dehumanised in the eyes of everyone else, and treated with less respect.
- Reconstructed: Alice delivers An Aesop, causing the rest of the cast to be more polite in future.
- Played For Laughs: Even Alice has trouble telling her comrades apart.
- Played For Drama: Alice is given a unique appearance to help rub it in when she's dramatically killed off.
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