Ari kind of needs a master. Since he set up to be a familiar.
The one that if they take too much damage they disappear to the plane they came from to recover from wound. If the master dies they do so to or disappear completely.
He can be snarky and quite a mind bender if he needs to be
http://www.spiritsoftheearth.net/smf/index.php?topic=25790.msg375256#newDont mind if master is evil or any alignment. Maybe we can get into more detail on how it happens.