Gaea
Gaea is the Greek titan of Earth, as well as being the mother of all life. Uranus is her son/husband (don't ask, the Greeks were weird), from whom they produced all the titans, cyclopes', and giants. From Pontus she created the primordial sea gods, all of whom ate shit as soon as Poseidon showed up. Cronus also propositioned her, but she declined. This probably had something to do with the fact that he had just chopped her husbands balls off. Among her notable children is Antaeus, who was invincible as long as he’s touching his mom. Heracles beats him in a wrestling match by lifting him up and choking him to death.
Gaea is arguably the most powerful and most important entity in Greek mythos. She is so far beyond the struggle of mortals, gods, and even her own children that she rarely does anything in Greek myth. When she does, though, civilizations are razed, the land is sundered, and the gods themselves weep.
Gaea is arguably true neutral, as she cares very little for anything that doesn't directly effect her. She is the uncaring mother of all life. Her worshipers will usually be druids, though realistically anyone who appreciates the land they stand on can worship her.