Elune, who is said to have created the greater naruu like Xe'ra according to Khadgar might be more powerful than we initially thought.
I think that the Light - who is not personified in the myths on Azeroth created Elune to be the light in the darkness, the moon on all worlds not just Azeroth. From her womb shall spring forth nature and arcane itself, creating a myriads of lives across planets.
This indicates her role to be far greater than just keeping Azeroth safe. She created naaru as guardians of the universe and shaped the trolls as they surrendered their old loa worship ways into night elves, her own physical representation on Azeroth as evidenced by Cenarius who is half-night elf as well. Night elves are therefore the pinnacle of Arcane Natural creation.
On the other hand there must be a yet unnamed father deity representing the sun, but people on Azeroth simply know him as the Light. Yet across all worlds, just as Elune is the moon, He is the sun and possibly created other greater naruu to act as guardians as well.
He is the source of Light creation and is responsible for forming the titans from non-living matter just as Elune would shape things from living matter. The Titan architecture in Ulduar and the architecture seen in the Halls of Valor emphasize the way Light creates through arcane processes on Azeroth. Dwarves, Humans, Gnomes in their original non-flesh forms are the pinnacle of Light creation. Blood elves, who surrendered their nocturnal ways and became diurnal also adopted his worship as the Light.