Batman #89 (2020) 1st Cameo Appearance of Punchline – 3rd Print
Batman is the secret identity of Bruce Wayne. Witnessing the murder of his parents as a child leads him to train himself to physical and intellectual perfection and don a bat-themed costume in order to fight crime. Batman operates in the Batcave, beneath Wayne Manor assisted by his butler Alfred Pennyworth. Punchline is a supervillain introduced in DC Rebirth. Created as the henchwoman to the Joker following his falling out with Harley Quinn, she serves as his underboss and partner in crime to the Clown Prince of Crime. Unlike Harley Quinn, Punchline is a very cold and sadistic character.
A future key for sure and possibly with her own series as well as featuring alongside The Joker in future Batman movies.