23.2a Determining Themed Teams
In order for a starting force to become a themed team, when you reveal your force during step 1 of Game Setup, you must choose a single keyword that all characters on your starting force share. If all your characters share more than one keyword, pick only one.
When playing in a tournament, can you choose different keywords during force reveal and have a different themed team per game? Can you choose to not have a themed team at all?