As always, it's best to print on cardstock. Just trim and fold the cards in half (front and back). Glue the halves together and you got yourself an NPC card.
These cards are 3x5 so they won't fit into a card sleeve. But the increased size allows you to fit in all of those character details you don't want to look up. If it doesn't fit, then shame on you for power gaming :).
Click the pic to get the schtick.