While Thanos used the Infinity Stones to reshape the universe in Infinity War, other MCU characters also used the Infinity Gauntlet in the comics.
When Thanos the Mad Titan wielded the all-powerful Infinity Gauntlet, his infamous absolute omnipotence resulted in the elimination of half of all life in the universe. The planets were destroyed, the celestial abstractions were subjugated and even Immortality itself was conquered. But for a moment, Thanos lost control of the Infinity Gauntlet, and Nebula, Thanos’ grandson in the Marvel comic book sequel, used a cosmic artifact to pursue him.
Even though he hasn’t had it for a long time, Nebula has the potential to become a more formidable force than Thanos. After Thanos collected the Immortal Gems in the Immortal Gauntlet by Jim Starlin, George Perez, and Ron Lim, Nebula, then a messy revenant, managed to tear the Immortality Gantlet out of Thanos’ hands. At that moment, Nebula simultaneously stripped Thanos of all his powers and became the same embodiment of pure omnipotence.
Nebula’s reign as the supreme cosmic entity did not last long. In a sad misjudgment, Nebula decides to erase Thanos’ achievements with the Infinity Gauntlet by using it to return the universe to where it was 24 hours earlier. Nebula brings all the felled heroes back, along with all the cosmic abstracts; Nebula manages to defeat them all, but not before Adam Warlock can erupt from the Soul Gem. In the ensuing confusion, Warlock obtained the Infinity Gauntlet and set the universe back to its original state.
But what would happen if Nebula kept controlling the Gauntlet? Thanos is dangerous, but his will is honed to the edge of a knife. For all the destruction he has caused, Thanos still has one goal: to win Mistress Death’s love and rule over all reality. Nebula, on the other hand, had no plans or goals whatsoever when she stole the Infinity Gauntlet from Thanos. His mind wasn’t as sharp and focused as Thanos’s because he had spent a terrible amount of time as an undead ghost in his grandfather’s hands.
A vision of what the universe would become in Thanos’ hands was demonstrated in Silver Surfer #55 and #56 by Ron Marz, Ron Lim, and Gavin Curtis. The Mad Titan created a planet known as Necrons to act as the center of the universe, a capital monument in honor of Death. However, there is a possibly even worse scenario at Nebula’s hands: the complete erasure of all reality. Life still exists in Mad Titan’s utopia, just as bleak. Nebulae, however, can destroy the very fabric of reality itself with evil thoughts. The same madness that befell Thanos started to infect Nebula as well so he may have created an equally terrifying universe.
Nebula in the MCU is characterized primarily by her desire to prove herself better than her sister, Gamora. As the film progresses, Nebula learns to let go of her blind hatred for her sister and integrates herself into the company of the various heroes she meets. Nebula in the comics has a very different background and cannot thus evolve during the Infinity Gauntlet. He desires to take revenge against Thanos and to claim total power for himself. However, with his inexperienced and fractured mind, the Nebula can become a raging force of chaos.
It’s hard to say what exactly Nebula would have created had she kept possession of the Infinity Gauntlet. He might have brought the balance back to reality; he may have created the perfect being, the true cosmic Eden; or he may have ushered in an era of chaos worse than the one Thanos created. In the end, the risk was too great an opportunity to take, and it was the right move from Adam Warlock to prevent Nebula from making such a decision with her divinity.