Just based on who reacts to what I'd put Wyll and Gale as good, with Gale having neutral tendencies, Shadowheart as on the evil/neutral line, and Astarion as evil. Lae'zel is neutral with some evil tendencies - She's definitely got more pride than is healthy and doesn't like being contradicted, but she generally doesn't disapprove when helping people nearly as much as Astarion and Shadowheart. YMMV though
