His normal form is the Kelvezu, the other three humanoid ones are for slipping past guards, or talking to clients of other races.  Hence the HUman make, Erinyes Female and (one more since half dopplegangers get three) and then the Yuan ti ability to transform into a demonic serpent :3<br/><br/>But if the rule slimit the half-doppleganger ability to 1 alternate form then that's fine too.  I can edit that in