Which sapient critters aren't playable? Runner's Companion gives stats for the Infected, Nagas, Pixies, Centaurs, Sasquatches, AIs, Shapeshifters, Free Spirits, Drakes... Pretty much anything you could think of except Merrow (which don't seem to want to deal with people much), Free Sprites (which, while nice, would be fairly limited in a game unless there was another way for them to grow than by absorbing a bound sprite of a technomancer), and Dragons (pure game balance here).