Simon H.Johansen wrote:3. Evil Insects From Outer Space. Aside from the SGAs, one of the most common archetypes and also one of the most evil. The name says about everything about them. By the way, most of them use organic technology. Examples: The Tyranids (Warhammer 40K), the Bugs (Starship Troopers), Species 8472 (ST: Voyager), The Geonosians (SW: AoTC), the Nephilim (Wing Commander: Prophecy), the Xenomorphs (Alien), the Spiders from "Lost In Space", the cockroaches from "Men In Black", the Zerg (Starcraft).
The Vratix from SW probably also fit into this category.
4. Little Green Men. Often regarded as the precursors to the SGAs. They're small, green and (vaguely) humanoid, although they don't have to resemble SGAs exactly. Often found in 1930s and 1950s pulp sci-fi. And usually, they're not as evil nor as ugly. Examples: The Saucer-Men (Invasion Of The Saucer-Men) and the Grots (Warhammer 40K).
How can you forget Uncle Martin from
My Favorite Martian?
7. Mean Mechanical Monkeyjumpers. (MMMs) They're robots and cyborgs and hell-bent on destroying humanity or, in some cases, all organic life. An interesting twist are the Yuuzhan Vong, who are the MMM archetype turned upside down - instead of being mechanical lifeforms with a hatred for organic life, they are organic beings with a hatred for everything mechanical. (although they don't belong in this category) Examples of MMMs are: The Cylons (Battlestar Galactica), the Borg (ST), the Cybermen (Dr. Who), Kronos (Kronos), the Decepticons (Transformers), the Necrons (Warhammer 40K) and the Venusian Robots. (Target Earth)
DALEKS!
8. Space Nazis. Either seen as fifth columnists operating with criminal gangs to prepare the way for invasion or your bog-standard Goose Steppers from the Vast Beyond, all of whom get their marching orders from the Great Leader. Sometimes seen in uniforms, sometimes in body-leotards with stocking hoods. Very common to Republic serials and the Japanese Starman series. Examples: the Dominion (DS9), the Azadians (Culture novel "Player of Games"), the Tau (Warhammer 40K), the Taiidani (Homeworld), the Puttiorans (Canopus In Argos), the Moon-Men (Commando Cody), the Officians (Rocky Jones: Space Ranger), the Zimarians (Evil Brain From Outer Space) and the Ko-Dan (The Last Starfighter).
The Covenant from Halo would also belong here.
9. Red Menace From Outer Space. Infiltrating Earth by stealth and subverting human civilisation from within; can either be humanoid, a totally alien lifeform which "replaces" normal humans with pod duplicates - or something even weirder (eg. shapeshifters). These were most alien menaces seen in '50s scifi movies at the height of the McCarthyite paranoia sweeping America then. Ubiquitous to American films, this stereotype is virtually unknown in foreign SF of the period. Examples: The Yeerks (Animorphs), the Bodysnatchers (Invasion of the Bodysnatchers), the Venusian Turnip Monster (It Conquered The World), the Genestealer Hybrids (Warhammer 40K), The Mi-Go (Lovecraft's Cthulhu Mythos), The Others (The Night The Heads Came) and the Beast. (Homeworld Cataclysm)
The Flood from Halo would fit in this one.
14. The Just Stupid Aliens. Well the name says it all. Aliens that are so stupid that one wonders how they ever got in to space in the first place (they might have gotten help). Examples: Pakled (ST), Gamorreans (SW), Thermians (Galaxy Quest).
15. The Obedient Tough-Guy Henchmen. A variant of the Proud Warrior Thugs. They're always affliated with Space Nazis, often serve said Space Nazis blindly, act as their soldiers, and they have often been genetically engineered by the Space Nazis for their purpose. Examples: The Jem'hadar (DS9), the Kroot (Warhammer 40K), the Turanic Raiders (Homeworld), the Taxxons and Hork-Bajirs (Animorphs).
I think you should move the Gamorreans from 14 to 15, since that's how they're seen in the films.
18. Uncaring aliens. This arch-type does not get itself involved with anyone else, and could personally care less about everybody else, unless they happen to get annoying. Usually, they also fit into some other archetype as well. (Usually the Angelic Space-Brother archetype) The most extreme example of Uncaring Aliens has to be the Kaminoans (SW:AOTC), who had nothing against all records of their homeworld being erased from the Jedi Archives.
The Sharu from SW are the perfect example of these.
22. Reptilloids. (thank David Icke for the name) Anthropomorphized lizards or other reptilia, usually their behaviour is more alien than their appearance. Sometimes downright evil. Examples: The Trandoshans (Star Wars), the Ssi-Ruu (Truce At Bakura), the Slann (Warhammer 40K), the Cardassians (ST), the Voth (Star Trek Voyager), Sarris' henchmen (Galaxy Quest), Grig (The Last Starfighter) the Serpent-Folk (The Cthulhu Mythos) and the Cobra-La (GI Joe: The Movie).
I can't believe you didn't include the Gorn.