Voted for Familiar, because it can really add to the flavor of the element you are playing. Also, the propositions are elemgants and well-thought.
Voted for Gem, because it doesn't increase the need of PC in decks if it's implemented. It's a buff to your weapon and shield, and so, you only need to deal with the weapon and the shield. This factor made me not vote for the other cool ideas like crest or coins.