lets go with the 4 of us then!
earth kind of atmosphere but some sort of gravitational differences, what you guys say?I'd much prefer a terrestrial planet like Earth, makes things a bit mroe interesting, plus it leaves a little more freedom with the environments, rather than everything being a desert, or ice, or forest..
Story twist!The Yuliari could work as more of a primitive race with very minimal technology, or even in more of a mechanical point in technology rather than super advanced.
Yuliari of Yulium are friend with human but humans are protecting them as well! this will let us push our selves to conceptualize humans being defeated and rising again for them selves and other species as well. So the guardians will be humans. the creature will be Yuliari people.