As a possible framework to go off, here's a rough concept for thirteen deities; six and six and one. Six are of the court of the sky (effectively Olympian), and civilisation, while six are of the deep earth (Cthonic) and the passions that underlie humanity. One, the Trickster, unites the two by being both and neither.
[Craft Goddess] presides over handiwork and craftsmanship of all kinds, and of construction and artifice in general.
[Destruction God] presides over war, conquest and annihilation.
[Reason God] covers intellectual pursuits, mathematics and scholarship.
[Inspiration Goddess] focuses on artistic creation, the subconscious and dreams.
[Fealty God] presides over marriage, loyalty, faith, oaths and trust.
[Passion Goddess] evokes lust, love, strong emotions, terror and insanity.
[Justice Goddess] stands for justice, balance and mercy.
[Retribution God] upholds vengeance, retribution, violence and ensuring insults are punished.
[Harvest Goddess] stands guard over crops, pastures, livestock, births and children.
[Storm God] looks after the wilds, the seas, ships, storms and sailors.
[Door-God] stands in liminal spaces, between doorwars, on the edges of life and death. His demesne is fortune and chance.
[Death-Goddess] sits firmly in the absolute, the certain. She presides over the underworld, and her demesne is fate and inevitability.
The Trickster holds sway over lies and deceptions of all kinds, but also over truth. In the mythology, he betrays the Old Gods for the New Gods because the Old Gods never treated him (or her) as one of their own. The New Gods end up distrusting the Trickster equally, and he/she remains an outcast.
As a result of the Trickster's deception, so mythology holds, the Elder Gods who once ruled earth and sky were forced into the depths of the earth and the seas while the Younger Gods took command of the skies and surface.
Worship of the Younger Gods tends to be open and public, with temples that reach towards the skies and elaborate ceremonies, while worship of the Elder Gods is often private and conducted personally or in small cults. Temples tend to be secret, or erected ad-hoc for ceremonies, but some of the Elder Gods, such as the Passion Goddess, are openly worshipped under the right circumstances (such as at feasts).
Just something we could work off, if we felt like it.