Until the chaotic evil does some shit that makes the good players immediately throw down, and they will, because 90% of tables don't have someone capable of playing an actual sneaky murder hobo or even a reasonable approximation of Astarion.

One Chaotic good, one Lawful good, One Chaotic evil

Assuming we're in some variation of 3e/pathfinder, I believe Druids need "Neutral" alignment of some flavor.