When it comes to anime, “This isn’t even my final form” is a trope as old as time. As the battle gets heated and the chances of defeat increase, heroes and villains alike reveal that, through either training or just sheer luck, they have at least one more powered-up version ready to go. At its best, like with Luffy’s Gear 5, the latest upgrade to One Piece’s future King of the Pirates, it can be absolutely thrilling. And watching fans react to the event (and inevitably argue over it) makes it clear why it’s become such an enduring trope for the last half-century.