"Eight-foot high and bottle green, the room's soft light waking gleams of malachite and cobalt among the tiles of his magnificent shell. Eyes as big as dinner plates, yellow and slitted, like a cat's, four hundred pounds, if he weighed an ounce."
But his eyes are only the size of saucers in "Agent of Change"
Edger might be short for a Clutch, given species comparison from "To Cut an Edge": Average Liadens are 5' tall, Terrans 7' tall, Clutch 9' tall 
more than nine hundred standard years old (which is relatively young for a Clutch Turtle)
T'carais (which is somewhere between father, captain, priest and mayor)
Of the working class (one third bigger than those of the Ambassadorial Clan)
Befriends Val Con yos'Phelium when they kill a dragon together. "I am called, in the short form used by the Clans of Men on those things called visas: Eleventh Shell Fifth Hatched Knife Clan of Middle River's Spring Spawn of Farmer Greentrees of the Spearmakers Den: The Edger."
By the time of Agent of Change his twelfth shell is "barely set" and his name is updated to "Twelfth Shell...".
Has made a study of human music, which he finds pleasing