The main Sumerian Gods are our very planets and the Sun they orbit..... what would you like to know???
The creation epic and small snippets of Mythology are mostly all that are left.... besides thier Gods they had almost 50 various demons/angels.... such as the one that the Movie "The Excorcist " mentions..... Pazuzu... this was the bringer of plagues.... he was the demon of locusts and disease.... more if you would like....
the Sumerian Mythos is based upon all of these Demons and Sorcerers who could summon them from beyond and control them.... almost all legend is derived from the Sumerians in one way or another..... Dragons, demons, wizardry, prophecy, creation epics.... etc......