wow! I really like your idea!
I guess it could be used by some events organizers, to give to people at the entry of the event.
When you meet someone and you both have the same color circled (even if you both have other colors circled as well), if you talk long enough to discover something you have in common with each other, you each mark 1 experience point. When you meet someone and you both have the same type of minion circled (even if you have other minions circled as well), if you share a funny quirk of your minion (even if you make it up on the spot), you both mark 1 point of experience. When you meet someone and you have none of the same things circled at all, if you tell each other the secret you have written down, you both mark 1 point of experience. In this way, you have the potential to gain 0-2 XP from each person you meet who has also filled out a card!