Perhaps...they could also like to become Pocky Ninjas on the side and fight for Strawberry or Chocolate? Only need to wear a pink or brown headband over your normal cosplays.
If not then, they could play rock paper scissors and call out their attacks when they win. RPG video game style!
Attention, there will also be a Tuxedo Mask at the K-con pool wearing a suit... that is swim trunks.