Yeah, don't get me wrong, I like all the characters in the game except maybe Mayrina. It's one of my favorite things. I even like the duergar though I wish I could filter their vulgarity.
But I'm just expecting to find out Gale has his own very sinister intent and part to play.
But I've had all sorts of theories about him. One was that he was actually Elminster, turned young by the tadpole situation or something. After all, Elminster has always been one of Mystra's favored.
Elminster is normally a witty, clever, and very charming man. He can, however, be imperious, grave, and terrible. Furthermore, he is a natural storyteller and a consummate actor. He rarely reveals the full extent of his true nature to anyone who is not an extremely close friend. He can portray himself as a trickster, rake, stern father figure, fool, or any other stereotype that he wants to assume, depending on what he wants to accomplish or what reaction he wants to elicit from those around him.
He has no known wife, but retains contact with several previous lovers, including the goddess Mystra — although his relationship with Mystra changed when the goddess was slain during the Time of Troubles and the sorceress Midnight assumed the mantle of the Lady of Mysteries.
Following the events of the Spellplague caused by the destruction of his patron, Mystra, Elminster lost much of his power but remained unaging. He continued to live in Shadowdale, but he became bitter and withdrawn.