Gale has been retconned heavily, do we already know how much is he a wizard now? That said, there are a few choices that make more sense than others. A gythianki soldier can easily be fighter, barbarian paladin or monk. A slave from hell can be pretty much anything. A vampire spawn can be pretty much anything. Anyone can worship a goddess without becoming a cleric of trickery. Anyone can make a pact with a devil without becoming a warlock. Then there is Gale.
I have to stress that I'm speaking without context though or, more friendly, I'm speaking bullshit. I haven't played the early access so I know the characters only by their descriptions.
