I think Glitch suffers from being too 'nice'. I want to poke fun, play pranks and cause a little chaos that doesn't harm or take items from someone but makes them smile or laugh.
Prank ideas: Items like water balloons, whoopee cushions, hand shake buzzers would require the ability to HIGH FIVE and/or shake hands.
Eventually they could move up to creating rube goldberg machines that make a fake Gwendolyn fly down from a tree or place a bucket in front of someones door that they step in and gets stuck on their foot for a few minutes.