Though I'd suggest as a matter of practicality that aliens (or robots, depending on how good AI is in this universe) really ought to be able to speak 'common' natively or have a 'universal translator' on-hand (or not-so-universal). Wookie roars and R2D2 beeps might be okay in movies, but they're hard for PCs to deal with.If a human could dress up as it for Halloween without special skills/CGI, then it's pretty fair game too. (Wookie, werewolf, most aliens from any popular sci fi)
Well, three quick points before I shut up on this:If you can do large-scale things in space, that means you pretty much have access to an entire star system's resources. And that's... a lot (consider that everything the human race has used, ever, is a small fraction of what's available on earth... and that's a tiny percentage of what's just in the solar system)... and a lot of pretty much everything, in just about any star system. Add in fast FTL, and given that there pretty have to be lots of empty systems for every inhabited one, and then you've got at the very least dozens of star systems' resources. There's no reason to go after anyone else's resources; you can pick off uninhabited systems at will.
Well this *is* a sci-fi game... and you did ask for questions in your very first post, right?Honestly I hadn't originally thought about explaining it too much because I had just assumed people would roll with it.
Strict definition of "humanoid" is two arms, two legs (which implies mostly bipedal), bilateral symetry. Head you can play with, I'm guessing, so long as you have the organs somewhere?I found a random alien generator online that gave me a bunch of decidedly not humanoid, but I did hit upon a winged race of herbivores with no sense of smell, and a cultural dislike of clothing. Push the gravity down the air pressure up, and the wing span out I can buy bat wings or maybe angel wings. However it pushes my suspension of disbelief for a race that different to successfully produce a child with a human. And I'm not sure if either count as humanoid.
I think 6 legs is pushing it but the rest of that is fine.
Though I'd suggest as a matter of practicality that aliens (or robots, depending on how good AI is in this universe) really ought to be able to speak 'common' natively or have a 'universal translator' on-hand (or not-so-universal). Wookie roars and R2D2 beeps might be okay in movies, but they're hard for PCs to deal with.
As to your questions:
Just curious, but why does she(?)
need to be a half breed? Unless Jemal has some indications otherwise, that would indeed seem to be entirely unlikely... unless it was deliberate? Say your other race is so strange in thought/custom, that they (or us, or both together) needed to build an organic bridge between them to communicate? A living translator equipped with the wiring of both species? Jemal did say that we had one extra-galatic species in the deck if we wanted to use it. That could be your parents. Of course, the reasons behind the "deliberate" might be more personnal (love comes to mind), though then you have to have had fairly powerful parents to have managed the interbreeding feat with ressources they commanded (doesn't have to be *your* parents though, nothing says the new breed has to be infertile (though probably only with itself without outside help, granted)).
By the by, if you're still going with your less gravity, higher pressure idea, you'll need some constant replenishing source injecting gas into the system (say accelerated degasing of the mantle or something, so heavy volcanic activity?), or dropping the gravity will automatically drop your air pressure as well...
Well, yes, I was sort of assuming same temperature ranges and gas composition. That said, enviro-suited alien are cool, it's trueYou are presuming earth too much.
Multi-century thawing cycle, maybe? A wandering planet with frozen volatiles rather quickly degasing when captured by a chance-met star? Remember though that your atmospheric loss to space may be slow, but you still need at least a good handfuls of million years of the present condition for organisms to have evolved to take advantage of them (ignoring useful pre-adaptations and assuming we're talking natural rates of evolution for the moment, of course). VV can likely give us a better timeline on that: how long *does* it take to evolve wings from scratch, VV?Yes if we lessened the gravity of earth the atmo would leak away, but it would take millions of years... So what if it started much much higher, and this is where it's leaked to now?
Your N₂, O₂ CO₂ and Ar would still be leaking out at accelerated rates though (since that's solely a factor of gravity and the average speed of each individual gas molecule, as affected by its mass and temperature), so you'll have to depend entirely on your initial "boosted level" of Ar to 1. compensate for the higher loss over time compared to earth, and 2. generate your increased air pressure. That would seem to indicate that you'll have to up its relative proportion quite a bit. Quick calc shows that if you wanted to up air pressure to 2 atm in pressent earth condition solely by changing the mix, as it were, you'd need about 50% Ar compared to the 1% we have now (I'm not entirely up on my gas cynetics though, so that might be wrong)... Is there a reason your atmo needs to be breathable by human? This is M&M after all. Just take a Run out of Air complication and/or a 1 PP Immunity-your atmo (this last only if you're expecting to meet it again in game, else you can power stunt it) and there you have it... Or, you know, just go with the "increased degasing" or "nested dyson shells" ideas I initially mentionned?Or beyond that what I was thinking of is, Yes a heavier N₂, O₂ Ar, CO₂, would leak away with lighter gravity. But what about a N₂ Ar, O₂, CO₂ would be heavier without leaking away as quick simply because the Argon is more massive. Krypton would be even heavier but is less common in the universe.
If you're worried about it, the moon may be replinishing it's atmo with captured gassed that have leaked from HD 28185 b.
It might also be a good idea to check with Jemal on the spread of artificial grav equipement in our galaxy (and the possibility of turning if off in only *some* sections of any particular ship/habitat?). I have the impression that Jemal might be going with the SG, Star Trek, Star Wars etc tropes on this one (i.e. 1g everywhere). As we'll probably be spending very little/no time on any PC's home planet, that might limit her flight ability some, to say the least.

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.