Mosaic of Saint Uriel by James Powell and Sons
Unlike many of the “missing” Archangels, Uriel already has a well defined place and personality in the cosmology of In Nomine. You can see it in the bios of David, Michael, Lawrence, and Khalid. You can even find a good chunk of his mechanics buried in the Ethereal Players’ Guide (pgs 140 & 141).
Uriel’s Servitors were never designed to be PCs. Their attunements are significantly more powerful than most, but their dissonance condition make them especially hard to integrate into a party.
Book of the Neglected 