That works well enough.  You do need to be aware that showing your character's hybrid form in public will incite major panic though, since you look uncannily like a Rakshasa, the main representatives of fiendkind.  That will pretty much be a major obstacle to your character's acceptance anywhere, since most common people will mistake you for a demon if they see your hybrid form.  (with your animal form, people will simply assume you're a druid)<br/><br/>Assuming that you can deal with being a 2nd generation genocide survivor and being frequently mistaken for a demon, I'll allow the character concept.<br/><br/>I question whether you'll be able to maintain a neutral alignment if you kill everything you bite though, because of how easy it is for you to slip up and bite someone while mentally influenced.  (if you put a bunch of feats into making your will saving throws unassailable, I won't worry about the killing thing so much)