The angels were made in this order - Michael, Lucifer, Raphael and Gabriel, and then the other regular angels - Seraphim next, then Cherubim, then normal Elohim angels. The angels were stationed as God's messengers, and no angel, with the exception of Michael, Lucifer, Gabriel, Raphael, Metatron and Gadreel, ever saw God, as only six angels in the entire Host had seen God, many angels doubted His existence, to the point where He became a myth.
In their true forms in Heaven, angels are as large as skyscrapers, with multiple animalistic heads, and can still speak, although their language, Enochian, is piercing and loud, where it can make people's brains bleed out from the sound of it.
The Archangels were allowed to see God, being the firstborn, and it was clear God had favorites among his own favorites - Lucifer was His favorite, and made him prideful as a result. Gadreel, however, was God's most trusted angel whom he assigned to protect the Garden of Eden After God created humanity, he demanded that all angels bow before them and love them more than they do even him. Lucifer refused, declaring that humans were flawed and murderous, when really, he was jealous that they replaced him as God's favorite.