Avengers 4: Predicting The Fate Of Every Avenger
21. Nebula
Current Status: Alive on Titan
Her Avengers 4 Fate: Nebula and Tony are alive on Titan, so will be paired up in Avengers 4 - albeit briefly. The blue cyborg has always been something of a lone ranger, so she won't be heading back to Earth with him. The Guardians' ship is still on Titan and Nebula must have one there too, so that makes two ships for two people; it's likely Nebula will leave Tony on his own while she jets off in search of Thanos.
Nebula is desperate to make her father feel that same pain he inflicted upon her as she was growing up. And, she'll want to avenge Gamora. Since she was left unharmed at the end of Infinity War, the filmmakers must have something planned for her, so we're guessing that she'll finally get to strike a significant blow against her wrinkle-chinned purple daddy.
She's no match for him physically, but she could utilise the Infinity Gauntlet (like she does in the comics), turning her father's greatest weapon against him. All Thanos does is cause Nebula pain, so it's about time she dealt some back in return.
But after Avengers 4... it's hard to imagine the character having a place in the MCU, considering her whole arc - from the very first Guardians movie - has been so closely tied to Thanos. Expect her to have a heroic death soon after wounding her father, dying with the knowledge that he's close to meeting his maker. Nebula sacrificing herself to take down Thanos would be the most fitting end to her story.