Chronicles of Orion's Arm
Below are species playable by player-characters:
“It turns out that there are a lot more species out there than anyone ever suspected there could be. Small, big, humanoid or not, but just so damned many of ‘em, you know? Current guess is that some ancient progenitor race seeded at least the various humanoid ones throughout the galaxy, but who knows? Anyway, a bunch are more prolific than others, starting with those damned humans. They’re all over, you know? They’re not particularly healthy, bright, or psychic, but what they lack in species uniqueness they make up for in numbers. Eventually, one of ‘em will stumble across the solution to a problem just by simply tryin’ everything at least once until something actually works, you know? And then they just repeat it everywhere else they go. And they “go” everywhere, right? Figure out how to live in a place, regardless of how damned inconvenient it is, and then live the hells out of it. Like locusts, you know? Take whatever they want from a planet and move on, right?" — a Sparrial in an odd moment of honesty.
(GM’s notes: I wanted more alien races in my game. So I lifted many of these from other gaming sources or movies, such as GURPS Aliens, and Disney’s Treasure Planet.)