10) Nova
Guardians of the Galaxy introduced us to the Nova Corps, but director James Gunn appears to have very little interest in introducing Nova himself in the sequel (understandable, considering the fact that the director wants to keep the focus on Peter Quill/Star-Lord as the franchise’s only human character).
However, Avengers: Infinity War seems like the ideal place for this fan-favourite hero to come into play, especially as the Nova Corps are going to need all the help they can get against Thanos. Bringing in Nova would be a smart move on Marvel’s part, too, especially as he’s a prime candidate for his own space set movie at some point in Phase 4.
Fingers crossed they go with the Richard Rider version instead of the younger Sam Alexander, but seeing any version of Nova on the big screen at this point would be great for fans.