Also, Prometheus paid a horrific price for helping humanity. Generally-speaking, the Greek pantheon is fairly self-interested, and not terribly interested in helping humanity in general.

https://en.wikipedia.org/wiki/Prometheus

In Greek mythology, Prometheus (/prəˈmiːθiəs/; Ancient Greek: Προμηθεύς, [promɛːtʰéu̯s], possibly meaning "forethought")[1] is sometimes referred to as the God of Fire.[2] Prometheus is best known for defying the Olympian gods by stealing fire from them and giving it to humanity in the form of technology, knowledge, and more generally, civilization.

In some versions of the myth, he is also credited with the creation of humanity from clay.[3] Prometheus is known for his intelligence and for being a champion of mankind,[4] and is also generally seen as the author of the human arts and sciences.[5] He is sometimes presented as the father of Deucalion, the hero of the flood story.[6][7][8]

The punishment of Prometheus for stealing fire from Olympus and giving it to humans is a subject of both ancient and modern culture. Zeus, king of the Olympian gods, condemned Prometheus to eternal torment for his transgression. Prometheus was bound to a rock, and an eagle—the emblem of Zeus—was sent to eat his liver (in ancient Greece, the liver was thought to be the seat of human emotions). His liver would then grow back overnight, only to be eaten again the next day in an ongoing cycle.

I don't think that any other character in the pantheon could realistically be called as sympathetic. I'm not sure that any other divine Greek figure deserves humanity's gratitude.