Originally, Jake Seresin’s nickname was "Slayer" but Tom Cruise intervened, and the necessary tweaks were made to give the character some nuance, including his call sign.
Monica Barbaro earned her call sign after one night out with the cast. "I had a pretty intense night of frivolity, we'll say, and I rose from the ashes the next day."
Jay Ellis told USA Today his call sign was pretty fitting from the start. "I remember just going, 'I love Payback! There's nothing better. I'm coming for payback!'"