So far in the games/lore I believe we encounter
- "God" (The Voice in the Darkness)
But I've been reading about the Xel'Naga and the species they tried to "uplift" before encountering the Protoss and later the Zerg. Are any of these species encountered in the games? I assume there must be non-sentient animals and stuff but are there other sentient beings or at least ones that are important somehow?