If I understood it correctly, they started with the evil characters, so Lae'zel, Shadowheart and Astarion are all supposed to be rather cruel or underhanded. Gale or the Tiefling from the hells might or might not be supposed to be 'evil'.
If neutral or good characters are still to be implemented, there could be a whole bunch. Some people mentioned Minsc, Halsin might be another one. But if the current characters are meant to be overwhelmingly evil then there would be a whole lot of characters still missing.
