ATM they resemble the Dragon Quest Hero imo :P.
I just can't think of anything really striking about their personalities. Both want to help others above themselves, which is fine, but I can't think of anything else about them. Wyll is just the angry form of Gale right now.
Astarion, Lae'zel and Shadowheart have things about them; but when it comes to Gale and Wyll, they are just a bit bland, generic, run of the mill Hero archtype.
