[@ReusableSword]  The others weighed in.  

So ... if he is a witch, he should be solitary; limited to the General powers.  If a natural, maybe the pencil trick (kinesis) or its equivalent in one of the other 12 theatrical powers.

Now if he can convince the coven to let him join, that would change.  Really that should be Vrani's choice.  His character is the coven's leader in fact - as the natural who knows something about wicca.  Diane will be the hardest to convince.  She is very slow to trust.