Firefly

Few villains in the G.I. Joe universe have cast as long a shadow as Firefly, who slipped onto the scene in 1984's G.I. Joe, a Real American Hero #24 — a Bronze Age debut crafted by the legendary Larry Hama and artist Russ Heath. Over four decades of publication, this figure has proven remarkably durable, racking up appearances across G.I. Joe, G.I. Joe, a Real American Hero, and even the wild crossover territory of G.I. Joe vs. the Transformers, with six of those appearances earning key-issue recognition from collectors. The company Firefly keeps says everything about their place in the mythos — sharing pages with heavyweights like Destro, Zartan, Snake-Eyes, and Duke, right at the heart of the conflict that defined a generation of comics. If you're building out a serious G.I. Joe collection, Firefly is exactly the kind of character whose appearances reward hunting down.