As far as unexpected team ups go, I think one of the more comedic characters would be a great match for Nebula's BFF. It would be great to see her no nonsense attitude paired with someone like Ant-Man or Spider-Man, who are constantly cracking jokes and are part of some of the MCU's funniest installments. These pairings would have the opportunity to create plenty of moments of levity, as Nebula will not pick up on the American sense of humor that both of them are so famous for. And on the Spider-Man side of things, she'd probably be confused as to why their mission is dependent on a small boy.