I actually have a player in my game that wants to make "The Luggage" as an ally spirit. Haven't decided yet, since "The luggage" is pretty friggin' awesome. Hafta think of something tough enough (as in, immune to freakin' everything, eats everything else, leaps tall buildings, etc). GUess high enough force would make it resistant enough to damage. Seems a little more like a free spirit (isn't really known for following orders anyways).

<shrug> Make the homunculus from Joshua tree wood and have an imp hide inside it.