How can I make intelligent NPC races that are truly alien?

They need to be:

  • Culturally non-human. They need to be stranger than any sort of human culture that already exists.
  • Rational. Behaving completely randomly, or with no logical purpose would be non-human, but not meaningful.
  • Physically humanish. The source of their weirdness shouldn't be something strange about their physiology, like having two heads or having a very strong sense of smell. What makes them non-human should be mental, social, cultural.
  • Eventually understandable. The PCs, after enough interaction with these creatures, should be able to understand their motivations and behavior.
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    \$\begingroup\$ Is there a requirement to be fun or interesting? Cause aliens are rather hard to relate to. Baby Eating Aliens that are... supposed to be more than just "oh, we can kill them, cool." present a very challenging role-playing experience. Just how "alien" do you want these? \$\endgroup\$ Jul 17, 2012 at 20:32
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    \$\begingroup\$ I would also recommend reading Ender's Game and Speaker for the Dead for great examples of alien mindsets. The "Buggers" and the "Piggies" are very well made and feel very alien. \$\endgroup\$
    – asteri
    Jul 19, 2012 at 15:24
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    \$\begingroup\$ See also: Creating convincingly alien viewpoints on Worldbuilding \$\endgroup\$
    – Bobson
    Jan 12, 2015 at 19:03
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    \$\begingroup\$ I'm voting to close this question as off-topic because, without specifying an RPG/system, this is just a broad, opinion-based worldbuilding question that's more suited to Worldbuilding.SE regardless. \$\endgroup\$
    – V2Blast
    Apr 14, 2019 at 19:49
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    \$\begingroup\$ Wordbuilding is not off topic at RPG.se. \$\endgroup\$ Apr 15, 2019 at 1:09

7 Answers 7


Creating an alien mindset is a matter of contrasting them with our own (else what are they "alien" to?), so what informs us?

  • Social – we break down in isolation
  • Tribal – we have a monkeysphere that limits our ability to grasp (or care about!) the scope of our actions' impact
  • Hunted – we are prey who just happen to have brained our way to the top of the food chain. We still think like prey, though: we're afraid of the dark and growly creatures.
  • Hunters and domesticators – we see our environment as a resource to be exploited
  • Vulnerable – we adapt our environment to suit us, we don't adapt to our environment. We're actually poorly-suited to most environments we find ourselves in.
  • Storytellers – our own and others' behaviours are only comprehensible to us by making stories about them, either implicitly as we think, or explicitly as we transmit culture.

Now, take one or two of those and change it. Keep the rest the same, so that you've got the basics of a framework that might be eventually comprehensible to a human. That's your method of making a person or culture truly alien while also possibly discoverable in principle.

For example, what if we change Social but not Tribal? Make a species of alien that developed from a prey-but-hunter species, that's vulnerable, and that have storyteller psychology. They evolved from a creature that was a loner, but somehow needed to (for territory and genetic purposes?) keep track of their kinship group. Their "social" interactions would be very aloof, possibly hostile or alarming, since they just don't need to care about the "social" impacts of their actions. They'd maybe be able to recite a geneology on demand, and might reference kinship relations the way we do politics. There would be an odd contrast to a human interlocutor though: they'd occasionally talk about "sisters" or "fathers", but in terms that contained no warmth and possibly with casual references to killing them off if they got inconvenient. Being storytellers, the internal politics and intra-familial colt/hot-war would be deep, tangled, and fascinating. Think Game of Thrones, but a species that doesn't understand the concept of remorse for causing others pain or injury.

As an exercise, pick one of the list above and change it to its opposite, and see what you come up with. The next one I'd be inspired to look at would be vulnerable, for example: what would a species be like if the concept of "shelter", "food", and other physical requirements were for some reason not in their hierarchy of needs, while keeping the rest more-or-less similar?

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    \$\begingroup\$ @Joe We're afraid of the dark and growly creatures frighten us, for starters. Also social and psychological threats make us react as if we are physically in danger. A non-prey hunter-evolved alien species would probably find the dark cozy and friendly, and be annoyed or angry at growly creatures presuming to challenge them. Think about how dragon psychology is generally portrayed, for an example of a never-prey species. \$\endgroup\$ Jul 17, 2012 at 22:43
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    \$\begingroup\$ @GregRos We adapt by sewing clothes and building houses, which is a novel things that distinguishes us. We're adapted to a partially-treed plain, but we replicate the beneficial features of that environment wherever we settle. \$\endgroup\$ Jul 17, 2012 at 22:58
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    \$\begingroup\$ @GregRos Also, being alpha predator for a long time late in our evolution doesn't mean we're not evolved as a prey species. We live and think the way we do because we don't like being eaten by tigers. \$\endgroup\$ Jul 17, 2012 at 22:59
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    \$\begingroup\$ @GregRos And on top of that, its disingenuous to call extincting a food supply animal or destroying the livability of a region we've settled "adapting our environment to us". Adapting doesn't just trivially mean "change", but rather "change to our benefit". \$\endgroup\$ Jul 17, 2012 at 23:02
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    \$\begingroup\$ @GregRos, I hope you guys do take this to chat. I'd be very interested to read how the conversation goes. \$\endgroup\$
    – Joe
    Jul 18, 2012 at 16:57

I believe the most effective approach to this would be to build your species from the ground up. When you try to make something "sufficiently alien", you are implicitly starting with humans as your baseline and making variations to that theme until it is different enough to meet your criteria. While this approach may work, it's usually not very effective and doesn't have the dramatic results desired.

To build a completely alien race (or as alien as is comprehensible to our human minds), I think you need to consider the absolute essentials of a living being, decide what you want those to be, and go from there. For example:

  • Every living organism requires energy in some form or fashion. How does your organism acquire it? (food, light, momentum, electricity, chemical reactions, background radiation... lots of possibilities)
  • If more than one of these organisms exists or has existed, it must have a way of communicating. How does it do so?
  • What environment fostered this creature? Under what conditions did it evolve or come into existence?

Once your answer these kinds of basic questions, an alien psychology will naturally emerge as you consider their logical consequences. To take humans as an example, we evolved on an ocean world teeming with other lifeforms, and that has dramatically shaped our experience of the universe. We are social creatures because we had to group together to survive. Our curiosity as a species is highly developed because our environment was so complicated that we had to know more in order to succeed as a species. And so on and so forth.

Also, because our primordial threats were sensed mostly through hearing and seeing, the vast majority of people are auditory or visual learners. These are the aspects of the universe we tend to focus on.

So let's say I was making an alien race. I've decided I want this race to acquire energy by consuming gasses and performing a very small-scale nuclear fission on appropriate types. And perhaps the biggest threat to this creature was ingesting gasses poisonous to it (methane, ammonia... perhaps even oxygen?). Then its primary means of understanding the world might come through smell or taste rather than vision. And this would fundamentally change that being's outlook on the world. Think about it; everything in human culture is based on vision and audio. What would a world look like if it were instead all based on taste and smell? Very different.

There are lots of other questions you can ask about the origins of your alien race, and there are myriad possibilities. But it's also important to remember the scientific limitations on life (as we understand them). At some point, if you make a creature too alien, you've made something that simply could never exist or evolve. Keeping this in mind, you need to strike a balance between deviating from the human circumstance/mindset and scientific plausibility.


I'm going to take a slightly different direction here, zeroing in on your qualifier of "human-ish."

How human do you want them to be? I get that you don't want them to be just physiologically weird, but there's some fun things you can do with a creature that's 90% human. The key is that you should never just make a change to the base template of human and stop there. Really think about them, picture how this thing works, how it survives. In doing so, you're also going to have to change your expectations of its enviornment, but I'll get to that in a moment.

Let's take your example of having a very strong sense of smell. Humans have five senses (maybe more in your setting, be it telepathy, psionics, magic or whatever, but I'm going to run with the five) but not all senses are equal. We see first, hear second, touch a distant third, and while we can taste and smell we don't rely on them. It's not that we're bad at those last ones (well, we are) but it's that we don't find them useful, and that changes our society and culture. We very strongly favor sight in our culture. Example time: Cars, the primary form of transportation for Americans at least, are impossible to safely direct without sight, but all other senses can be pretty much ignored. Next time you're driving, think about what it would mean to have hearing be the dominant sense for humans -- instead of street signs, there would be speakers emitting a constant tone. Instead of changing streetlights, there would be different sounds depending on what everyone should be doing. Another example of the Hearer society -- how many times as a kid were you reminded to look at someone when they were talking to you? This is because most humans lip-read at least a little (how often do you say "Sorry, what was that?" on a phone as apposed to being face to face, even in a loud room?) and a lot of communication is nonverbal anyway. But the biggest reason for looking at people when you're talking to them is so that you can't focus on something else. Wherever our eyes are, that's what has our attention. Listening to other things is bad manners (headphones out of your ears please) but nobody minds if you're fiddling with an object (touch) smelling something good (smell) or eating while you're listening (taste). So a hearer society might not care where you were looking when you were speaking, but would be annoyed at background noise. I can imagine messing with the PCs of a game by having an NPC wander around the room while speaking, seemingly paying no attention to them. But that's not really alien is it?

Back to smell. Lets take a human, but diminish sight to a peak at around 20/40 -- enough to legally drive, but barely. Boost smell up a bit, but we don't need as much as you'd think. Most humans can already distinguish where they are, who is near them, and what things might be in the area. Basically, lets just assume that Smellers can distinguish multiple scents at once, which is something that gives most humans trouble.

A human having a conversation with a Smeller might think they weren't taking them seriously. After all, the Smeller isn't looking at them, but wandering around the area nearby. It's still a spoken conversation, but this seems disrespectful, especially, when the Smeller turns their back on the human! This makes the human nervious, as the conversation is an important one. (My friend has been kidnapped / the evil emperor is coming / etc.!) The human has just physically exerted himself by running away or fighting someone. Still, the human takes care not to allow his face to show his feelings. Suddenly, the Smeller takes a deep breath, and says "Why are you so afraid? Where are you hurt?" The Smeller is picking up on the scent of sweat that most humans pump out when we get nervous, or the scent of blood. Suddenly, the smeller looks surprised. "The emperor's guard are here!" The human looks around confused. He doesn't see anything.

Societies would compound this difference. A good hiding place for your house key might not be under the welcome mat, but in the flowerpot. They might not bother to bury the key at all -- the fact that the flower hides the smell of it is the important thing. I'd love to make some PCs paranoid by 'hiding' a treasure in plain sight, surrounding it with air fresheners. Perfume woud be like wearing a mask. Since families smell a lot more alike than they look, there might be a stronger sense of clan unity as people don't differentiate among members of other families. If you've ever gotten in trouble with your significant other because they were upset but you didn't notice the body language cues, then picture that but with smell. An NPC Smeller could be pheromone-wise weeping his eyes out or making his hands into fists without the PCs noticing. How do Smellers drive? Certain scents probably have specific meanings -- much as red in america almost always means stop, I can imagine manure (and a specific kind too -- cow manure smells very different from chicken waste, which smells different from horse manure) means stop in Smellville. Strong wind causes you to slow down as location becomes harder to pinpoint.

But this is still a fundamentally human thing. It's just interacting with its environment a bit differently, even if it might really confuse you. What can we do to change that? Three main ways occur to me.

  1. Continue making assumptions as to how this would change their culture, and play up those changes. What if Smellers treated members of a family as functionally the same person? This grows out of the difficulty of distinguishing between people who live together, but that might very well be alien enough. It's not a hive mind (which, while cool, is a bit overdone) but could be creepy. The key here is to construct a set of rules that makes these creatures different from human normal behavior, with each rule tied directly to the physiological change (i.e., all members of a household are treated as the same person, because distinguishing individuals is difficult. Being unclean is a sign of strong disrespect, because it's offensive and makes you seem low class. (Imagine someone showed up to work in ripped jeans and a stained tee shirt.)). You want these rules to interact in interesting ways, but together create something that is very strange and different. This makes the culturally non-human, humanish, but clearly rational and eventually understandable. If you're spending a long time with these creatures, you might even make each rule a feature of a session. (The party is similar enough they smell the same, the rogue steals something and the cleric gets punished for it.) I'd think of at least five such rules, probably ten.

  2. Make assumptions about how the individuals function, beyond the obvious. Yes, shifts in the wind would change what they're aware of -- so "I'd keep him upwind of you" would be an interesting idiom, but really we're looking for interesting individual behavior. They would move to keep themselves downwind of most people. Imagine during a conversation they just keep circling. They would be comfortable in dark places, something that will always set a human's teeth on edge. They would dislike rain and deep water. Swimming would probably be right out. Smell alone doesn't tell us much about this, but think about where they are on the predator/prey continoum. Are they group creatures or loners? If they use technology, how much do they rely on it? (Technology isn't just cars, computers, and guns. If they have iron, or use spears or bows, that's technology too. Do they build houses?) Are they sexually dimorphous? Do they reproduce sexually at all, and if so are there only two sexes? (Going back to smell again, I could see having fun with an extremely sexually dimorphous creature whose dimorphism is not expressed in what the body looks like. No mammaries for females and a genital sheath for males, but with pheromones distinguishing them could mess with the players.)

  3. Make assumptions about the environment. If they come from the same ecological niche as humans, they'd be the same as humans. Carnivorous species are always scary to humans, since they display what seems to be a lack of fear response to us. Plus, there's always something frightening about the fact that they might just eat us. Herbivorous creatures can be equally strange -- eyes on the side of the head, prone to run first and ask questions later. What kind of place do they come from? Here, you would impress the strangeness and alienness of the world on the players. Maybe everything has a natural camoflage? Maybe it's night twenty hours of a twenty-four hour day? Maybe most of the planet has tunnels beneath the surface where everything lives? If the aliens are not on their home planet when the players encounter them, what assumptions do the aliens make? "The wind is picking up. We must get inside before the acid rains." "They went into the forest. The plants will probably eat them." "Leave him. There is no saving the wounded, their blood will only draw more foes." This creates a culturally different, though seemingly human result that can be understood once the players see the enviorment they come from.

There's a limit to how non-duck something that looks like a duck and quacks like a duck can be. The uncanny valley is your friend - something very close to human but fundamentally not can be even more strange than something that didn't look human to start with. You'd be surprised how much mileage you can get out of very small changes to the human body. Get rid of thumbs! (That will change how individuals function like crazy.) What if taste was somehow the primary sense? (No idea how that would work on a basically human frame -- a really long tongue is probably too much, but if they looked human right up until a twenty-foot tongue stuck out you could probably get a rise out of somebody.) What if they were entirely human, but entirely carnivorous? Make small changes, and then try to imagine how those changes would affect the cultures, individuals, and what it means about the environment they came from. Then play up those changes!


How about some aliens from Sci-Fi:

They truly believe (with some evidence) in reincarnation.

  • Death? No big deal, you'll be back.

  • Disabling injury? Kill them, there's no reason for them to suffer, they'll come back again.

  • Suicide mission? No big deal, they'll be back.

Or, how about a race of limited but accurate and pervasive precognitives?

  • Nobody asks anything because deciding to ask is enough—they know the answer.

  • Crime is effectively unheard of as you can't get away with a crime that will be discovered within the range of the precog ability.

  • Nobody ever lies.

  • Nobody ever fails at any project that will take less time than the range of the precog ability—you know at the start whether you'll succeed and thus if you're going to fail you don't try.

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    \$\begingroup\$ You would also be able to do a lot of learning by intending to attempt something, seeing it go wrong before it happens, then learning from the result. \$\endgroup\$
    – Joe
    Jul 19, 2012 at 5:40
  • \$\begingroup\$ Have you read Alfred Bester's The Demolished Man?... <\rhetorical question> \$\endgroup\$ Aug 14, 2012 at 7:56
  • \$\begingroup\$ @Sardathrion: No, I've never read it. Race #1 is out of a sci-fi story, though. \$\endgroup\$ Aug 15, 2012 at 1:43
  • \$\begingroup\$ @LorenPechtel: Well, you should read it as what you describe as the second race is very very close to the setting of the Demolished Man. \$\endgroup\$ Aug 15, 2012 at 6:49

Put them into an environment that makes them r-strategists instead of k-strategists. For fantasy, maybe they live in an area of chaotic magic. They age quickly because of the magic and have large litters which quickly form independent packs. The magic makes the food supply vary wildly, so their babies quickly turn cannibal during famines. Adults tend to avoid these roving groups of cannibal children. In fact, women form communities together, excluding males to minimize litters; they understand the horror of the cannibal children packs. They are, however, thwarted in their efforts because they experience estrus keenly and seek out males periodically. Males live mostly in isolation, as they tend to kill each other in competition for mates.

In a sci-fi setting, maybe irregular orbital mechanics cause the environmental irregularities.

Many stories feature r-strategist comparisons with humans. Examples include Mother of Demons with (iirc) herds of stupid children which don't receive much care, and the Chris Longknife series with sponsors for entry into adulthood instead of parents. Goblins are sometimes portrayed as r-strategists in fantasy.

A PC's first encounter with this sub-species should be troubling.

Thief: We seem to be surrounded by children.

Cleric: They look hungry. We could share our standard rations with them and resupply at the next town.

Fighter: They're running towards us, and I don't see any parents. Maybe there's been some trouble in a nearby village.

Cleric: Come here young ones, tell me what is the OH MY GOSH THEYRE EATING MY FACE.

Magic-user: I cannot seem to disperse whatever effect is causing them to act this way.

Fighter: Then we will subdue them and return them bound to their village; perhaps the elders knows what is affecting them.


[More antics ensue when the heroes try to return the children to the village, but the women drive off the men and children.]

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    \$\begingroup\$ I like this. Fantasy cliché is that goblins are small and weak while orcs are big, but what if they're just one r-strategy race and orcs are just adult goblins? I did this in my world, justifying both ordinary goblinoid "cannon-fodder" strategies and frequent occurence of excellent orcish warriors are a challenge for high-level PCs even by themselves. \$\endgroup\$
    – Pavel
    Nov 27, 2012 at 13:13

I'd like to add an answer which goes in a different direction that could well be combined with the physiological distinctions discussed so far.

A lot of what makes humans humans is the way how our society works, the rules imposed on us and the way we deal with this as individuals. Therefore I'd suggest to also start tinkering with societal parameters.

And while these are of course based on certain evolutionary, sociological and anthropological developments, it might be easier to put the cart before the horse: come up with a very alien society which makes for interesting engagements and challenges, and then find plausible reasons as to how this society came to be this way.

How about an alien society ..

  • which is subordinate to an irrevocable breeding program. Every relationship, physical and otherwise, is prearranged as per the orders of some higher authority (elders/council/technocrats/...).

  • which is subjugate to a rigorous caste system (think Huxley's Brave New World). Every caste has their preset roles, tasks, rituals and relationships; where breaking out of this system is unimaginable to its members.

  • whose members do not conceive themselves as individuals, but always as part of one whole. Who will always put the tasks and interests of their race/clan/family before their own? Or who do not even have interests of their own?

  • \$\begingroup\$ For example, the Qunari from Thedas (the Dragon Age setting). \$\endgroup\$ Jan 14, 2015 at 12:11

First, terribly sorry for my English, but the question is very important, and I'm trying to focus on topic and content.

Sorry, but all of this is started from the end of process not from the beginning.

The basic question is: Are players able to play as the member of the alien race or not?

All these tips are good, but only for alien beings as NPCs. As a constructor (game master or game developer), who want to create some new alien race, you should see this race as a player. The player has a different point of view for an NPC-only alien race than they do for a playable race. Regarding the previous post, let's try to think about this example:

One of your players plays as a alien creature, who is blind and has very strong senses of smell and touch, but the rest of the team play as humans. In this case. the Game Master shall split the team and provide one description of the surrounding area for human PCs and a second, different kind of description designated only for the one alien PC. It is possible, but it's very demanding and only a very skillful game master is able to do this without losing immersion.

The second: each player is human, so he/she thinks like a human. For example: a player who plays as a bird is used to thinking about how to climb a wall, not how to fly over the wall. Or how the player will play as a alien creature which has no hands - for example, how will the PC open a door, when he/she plays as a snake? Will he/she try to bite the door-knob, or wrap his/her body over the door-knob?

I know this example is a bit silly, but it's good to illustrate the issue.

So, the fact of the matter is: how can you create a alien race, which is able to play as a character, not only as NPC? and how will the Game Master shall cope with the differences in game? In this case, the conclusion is simple. Each alien race playable as a PC must be more or less human-like, by which I mean this alien race must have two hands (or equivalent tentacles or something similar), two legs, and at least one head (not exactly literally, but playing as two creatures with one mind controlled by one player shall be very difficult for a player and for a game master).

For example: player plays as two twin fairy-like aliens, who have two bodies but one mind (and cannot be separated for a distance longer than 10 meters). So if one of the fairy's bodies sees or hears something, the second sees or hears this too. But the bodies can act independently. How will the game master deal with the player who is able to be and act in two places at a same time?

A more complicated example is a player who plays as a swarm with one mind. This kind of swarm is able to send its members as a scouts and trespass through small holes in walls, and is able to disperse itself in order to hide.

Consequently all the issues mentioned above will strongly affect the game, gameplay, and probably the game's scenario. The main game master's (or game developer's) responsibility is to make sure the game and gameplay is consistent and playable.

So the best advice is: each game master (or game developer) must not create an alien race that the game master and fellow players cannot cope with. So at the start, the game master should honestly evaluate his/her game and storytelling skills, and evaluate the players' skills.

That is why many alien races in games are human-like. For example: D&D series and Mass Effect. All those elves, dwarves, orcs, etc. are human-like because of fact that those races must be playable for beginners and intermediate game masters and players without ruining the game and gameplay.

So when the game master wants to impress, shock or amaze the players, it is quite simple to create an alien race. But each game master should know that sooner or later, players will be curious how would it be to play as a this alien race - and this is a far more complicated story, because a good game master always must think three steps ahead.

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    \$\begingroup\$ Welcome to RPG.SE! Take the tour if you haven't already and see the help center if you need more guidance. I can't tell whether this tries to ask a new question; "How do I make an alien PC option?" or whether it is an answer unrelated to the actual question, or it is trying to answer, but failing to get it's point across. \$\endgroup\$
    – Someone_Evil
    Apr 14, 2019 at 13:58

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