Avengers: Endgame: 15 fan theories so crazy, they might be true
By Mark Lynch
5. Nebula beats Thanos
There aren’t a lot of people who hate Thanos more than Nebula. First, he routinely took parts of her body after she lost fights to Gamora. Second, he made Nebula hate Gamora despite really loving her. Lastly, Thanos tortured her for the location of the Soul Stone.
Those are just three of the many reasons why Nebula wants to be the one to kill the Mad Titan. The popular choice would be for Captain Marvel to get the final blow, but that honor could go to Nebula.
Crazy Scale: 3
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In the Infinity Gauntlet comic, Nebula actually took the Infinity Gauntlet off of Thanos’ hand. She was later tricked into reshaping the universe the way it was before Thanos made his tribute to Death. This is a definite possibility in Avengers: Endgame. If Nebula gets her hands on the Infinity Gauntlet, she may go mad with power after she transforms herself back to before she was mostly machine.
If this was before Nebula changed her ways, she may have had to be tricked. Considering that she’s a whole new person, it won’t be the case this time. One thing that should be considered is that Nebula may die after using the Gauntlet to set things right. We saw what it did when Thanos used it. It’s doubtful her body is strong enough to use the power and survive.