Personally, I don't think the chance of the character creator option spawning into your world isn't really fair, because then people could just make creatures with the genes they haven't unlocked just to breed them in so they could invite them and breed. Plus, this sort of defeats the purpose of the challenge in this game because you're suppose to adapt to the environment through natural occasions, and simply creating what you want and spawning it into your world and breeding with it 24/7 with all new immunities and stuff is kind of cheating.