Just to cover myself, all of the following is within the context of a lore tag. Any species not visually taggable as alien should remain out of the standard tag, and preferably be moved to a separate wiki.
I changed my mind on parts and re-wrote this while low on sleep and being distracted a lot so it's probably still wonky as heck. I just wanted to plug as many holes as I could.
What would classify as an alien in that case? As mentioned before, the term "alien" just refers to something "belonging or relating to another person, place, or thing". It's a question of scope beyond that. If it's "a creature/species not from Earth", quite a lot would classify, especially for settings that don't take place on Earth (Luke Skywalker is an alien).
So, what would alien_(lore) mean and apply to? If it's just "the creator said they're alien, then they're tagged alien", that doesn't seem very useful to the tagging system. The creature's wiki would probably be a better place for that information. Also, should it apply to whole species, or specific characters? Would a wookiee born on Earth still count as an alien?
Based on current the opening line of alien:
An extraterrestrial creature not in traditional myths and not native to the planet Earth.
For the purposes of a fantasy-based setting, terrestrial should be considered to mean (if available) the primary planet within the source media, unless Earth is also a significant location.
- Alien status should be considered at species level, not character.
- An alien transposed into an otherwise Earth-only setting is still an alien
- Settings and artwork featuring primarily species identical to an Earth (including mythology) or otherwise terrestrial species must contain reasonable evidence that they are intended as a separate species.
- If this is unclear, assume not alien
- Artwork+sources must contain reasonable indication a depicted character is not simply in cosplay or disguise.
- Wookiee: Established non-terrestrial origin + not in traditional myths = alien
- Yeti: Mythological = not alien
- Fox_McCloud & Co: Standard anthro cast but in space. = not alien
- Star_Wars humans: Humans in space = not alien
- Caitian: Established non-terrestrial origin = alien
- Lombax: Non-Earth creature in a space-based setting = alien
- ”The artist says so” blue cat = not alien
I want to pull more examples from your other post in the lombax thread.
[...] What makes turian an alien but not khajiit? Why's troll_(homestuck) an alien, but not mizutsune? They're all species that don't originate on Earth, are creatures designed with aspects of real animals but aren't themselves real animals, etc.
*turian: Established non-terrestrial origin = alien
*khajiit: Nirn is effectively a fantasy-terrestrial stand-in = not alien
*troll_(homestuck): Established non-terrestrial origin = alien
*mizutsune: I'm led to believe the Monster Hunter world is a standard fantasy-terrestrial stand-in = not alien