The Nova Corps actually plays a pretty big role in Guardians of the Galaxy, but we mostly see them acting as a massive interstellar peacekeeping force, without a lot of emphasis on individual members. On one hand, that makes sense—that movie already had five people/trees/forest creatures on the main team, plus two huge villains, plus the Collector, and the Corps is a pretty big deal in recent comics—but it does mean that we skip over the character who introduced us to the Corps to begin with: Richard Rider.
Created in 1976 by Marv Wolfman and John Buscema, Nova, a.k.a. the Human Rocket, was meant to be the Bronze Age's sci-fi answer to Spider-Man: a teenage hero who inherits the helmet and powers of a Centurion who dies on Earth—and if that sounds familiar, well, it's basically Green Lantern's origin, too. He'd bounce around the Marvel Universe for years, and while he was never a huge player, he was a big deal in Annihilation, the crossover that reintroduced the Star-Lord and the Guardians.
What really makes this interesting is that while Rider isn't in the movies, his predecessor, Rhommann Dey, is, played by John C. Reilly. Nova's also a founding member of the New Warriors, a team that's set to hit television screens sometime in 2018, and while he's not listed as part of the cast alongside Squirrel Girl and Night Thrasher, an appearance by the Nova Corps could certainly help tie it to Marvel's money-making movies.
Plus, c'mon. The guy's name is literally Dick Rider. There's no way the Guardians movies can resist throwing that one in there at some point, right?