Every God is a beneficent unity or a unifying excellence, and has this substantive character qua God
Proclus
The 12 Gods are perfect beings that each express divine modalities within God while remaining distinct from Him. By understanding and communing with the Gods, we come to understand more about the Divine and our place in the universe.
The Gods can each be understood as a prism that splits the white light of God into many colors. Most people will find a particular affinity to one of the Gods and form a more dedicated worship to them. Over time, they will come to see that all of divinity is found within their chosen patron God.
The Gods reflect each others divine light and are united through God.
The primary Gods are
Jupiter, Juno, Vesta, Minerva, Ceres, Diana, Venus, Mars, Mercurius, Neptunus, Vulcanus, and Apollo.
The creators of the Universe are Jupiter, Neptune and Vulcan; the animators Ceres, Juno and Diana; The harmonizers Apollo, Venus, and Mercury; and the guardians Vesta, Minerva and Mars
Sallustius
There are hundreds more Gods within Romanism as the Divine is manifold and we can recognize it in many things. However, worship of these primary Gods makes up the core of Romanist worship. All subsequent Gods outside these 12 are contained within these primary Gods…
… As for instance, Bacchus is in Jupiter, Asclepius is in Apollo and the Graces are in Venus.
Sallustius
The best way to begin exploring the different personalities and attributes of the Gods is to read and pray using the Orphic hymns and begin reading their Sacred Myths.
While we recognize that there is syncretism between the Roman Gods and Gods in other cultures, we do not mix our theological systems and Gods in an eclectic fashion. Mixing Gods from various pantheons distorts the understanding of them as a whole and breeds confusion. We do not believe that the Gods can be removed from their traditional context and still be properly understood. Therefore, we worship only Roman Gods and foreign Gods that were brought into the Roman system in antiquity like Isis or Mithras. In time we may be able to adopt more Gods into the Romanist system but that choice must come from a place of authority and sound theology, not personal preference.