Wyll I suppose. His folk hero aesthetic feels about right for a level 3-4 character and reaching by a pact is a nice touch and I like his heroic selfishness. Lae'zel would be next but she's just so chaotic stupid it grates fast and right now that's basically her entire personality but she does at least have a potentially interesting arc. Shadowheart is too dim to be involved in any kind of subterfuge, Gale is an entertaining jerk but someone really thought they were writing a character for an epic level game. The less said by or about Astarion the better.