Apollo
Apollo is the Greek god of sunlight, healing, archery, knowledge, music, art, and a million other things the Greeks thought were nice. Arguably one of the most important gods outside of the big three, he is the son of Zeus and Leto, as well as the twin brother of Artemis. He is often portrayed in media as happy, care free, and loving, but with a penchant for murder when push comes to shove- though that's true of most of the Greek pantheon.
Apollo is also the god of oracles, which is invariably going to be important for any GM trying to push his intrepid Adventurer's down a certain path. Apollo is typically considered to be chaotic good, and will generally not try to screw people over unless they're being a dick.
Given his aforementioned chaotic goodness and his penchant for healing, Apollo makes an excellent god for Clerics, as well as a strong pick for Paladins.