Angels - G

Gabamiah = The Mercury Angel, because when he manifests he is covered in the element of mercury (which is not healthy for Earth-bound beings). Gabamiah often wears armor and weapons that have little channel pits filled with mercury. 
Gabriel = St. Gabriel the Archangel is often called the Herald of God for his announcing the birth of Christ to the Virgin Mary. He is of course the patron of the Order of Heralds and those who follow him will develop some of their powers. 
Galgamil = Another name for the Spheres. 
Gambriel = Gambriel is a mysterious Angel with a mixed history, sometimes appearing as a Loyalist, other times appearing alongside Fallen Angels. Yet the Senior Members of the Archangel Order treat him as one of their own? It is widely believed that he serves some odd or subtle role between the Loyalist Angels and their fallen kin. 
Gedariah = An Angel of Subterfuge who often appears in disguise as an old man or hobo on Earth. 
Geis = The Geis is a hypothetical theology that seeks to explain the close relationship between the Order of Archangels and the Order of Infinity. According to the Geis theory, Celestials are pre-programmed in their instincts to be loyal to God. The Order of Infinity, who view themselves as being God's closest disciples, have come to be stand-ins for God in the collective psyche of the Archangels. This theory is unproven and mostly held in derision, but it is worrisome in its implications. 
Genii = A class of Angels who either grant wishes or put mortals to the test. Believed to be responsible for many of the stories of the Geni. 
Germiel = An Angel who possesses the power to animate non-living things, especially natural elements like clay, wood, rock, trees, etc. It is believed he directly oversaw the creation of Adam and Eve. 
Glorious Ones = Euphemism for the Seraphim. 
God = God is The Supreme Being and is the source of all Angels and all Adepts. Among the Order of Archangels, the Order of Infinity is viewed as being especially dedicated to Him. 
Gog And Magog = Two powerful Nephilim associated with the Middle-East. 
Grace = By dint of their very nature, all Celestials possess at least some measure of Grace. 
Gradiel = Angel of Asteroids, he is often found lingering in the rings of asteroids in space (along with other Angels like him). 
Grigori = Older name for the Watchers, that class of mysterious Angels who collect knowledge and are heirs to secrets older than the universe. Mortal Archangels suspect that Grigori is the name for the leaders of the Watchers. 
Guideposts = Guideposts is a regular publication magazine that often features stories of encounters with Angels. Many of the writers and editors of the magazine have personal backgrounds in the study of Angels. For more info see Guideposts (external link).
Guardian Angel = An Angel whose vocation revolves around protecting someone or something.