Of all the Easter Eggs, cameos, and character introductions, the most significant reveal amounts to nothing more than a name spoken. But that's all we need. In the second to last post-credit tag, not-so-perfect being Ayesha, played by Elizabeth Debicki, sulks about her defeat at the hands of the Guardians. Plotting her revenge against the lovable "A-holes," she cranks up a new gestation pod (similar to the cocoon teased in the Collector's stash in the first film), naming her new being "Adam." At last, Marvel fanatics rejoiced as James Gunn finally "gave birth" to Marvel mainstay Adam Warlock.
First created by Stan Lee and Jack Kirby for Fantastic Four #66 in 1967, Warlock was fashioned by the fanatical geneticists in the Enclave. Engineered to be a superior being, he soon left his creators' petty squabbles behind in favor of more universal threats and esoteric quests. The character truly didn't evolve, though, until artist and writer Jim Starlin foisted him into a starring role between the '70s and '90s, when he saved the universe several times over, screwed it up thoroughly as his alter ego Magus, and worked over (or teamed up with) Thanos at various points.
Warlock's introduction is huge, especially since we already know James Gunn is a huge fan of the character and has "big plans" for him. Early rumors hinted he'd play a sizable role in Avengers: Infinity War, but studio boss Feige recently shot those notions down, proclaiming his absence until at least GOTG3—unless he's bluffing, of course. Once released from his cocoon, Warlock and his evil alter ego could do some serious damage to the MCU. For that reason alone, Adam Warlock's blip on the MCU's radar is a massive one.